How to put geographic lat/lon projection elevation dem at snap? There's a gap at 30:06 . just figure out, do not change WSG 84 (keep it default) and allgo the rest is exactly how it should be. Thank you for the video.
Thanks for your video. I would like to know why we used two images to do this. And I would like to compare two days' dem(before and after rain). How could I complete this goal? Should I use two days' images to form A, and then use another two days' to form B?
How can I merge two overlapping DEMs that are generated from the process that was shown in the video? Half of my study area is in IW1 and half in IW2, so I need to merge those.
Thanks for the video, everything is very clear. I have a problem, when I select the selected file at 22.52 into the video, I get an error with the GDAL product reader. How can I fix this?
Hi there, thanks for the video, it is indeed a good method for areas without dem data. After I studied and followed the steps, and read the comments, I have already know this method is not applicable for urban and vegetation areas, this is a pity. My goal was to generate the latest and accurate-to-a-certain-extent (within 30) dem for my AOI, since you know, most of the publicly-available dem data were from like 10 years ago. Apparently this method is not going to help me with my goal, but I do have a few questions: 1. what is the actual resolution of such a generated dem and how can you check this? With the pixel size? 2. how do you cover your AOI during the spit and burst step? In the video you can see that the burst grids only cover part of the red square, right? 3. I generated a dem by following the video and exported the tiff files, but when I compare it with the srtm dem, there is a very big difference on the band values, espeecially the band values, the generated dem has values on band 1, 2 and even 3 and 4, but the srtm only has band 1, how so? 4. Do you happen to know any other way to help with my goal? I could really use some of your professional experiences on this 🤣🤣 Looking forward to your replies and thanks in advance 🙏.
thank you for the video, but I have a problem whit the S-1 TOPS Split, because when I run the analysis appears this error:" SOURCE PRODUCT SHOULD BE MULTI SUB SWATH SLC BURST PRODUCT". What I do to solve this problem? thanks a lot
Hi there Thanks for the video Why do we choose the basic criteria in the negative (-) direction? Also why do we choose the closest vertical criteria? Why is there no vertical criterion in the minus (-) direction in a sentinel image dated Oct 04, 2014? Thank you for your time ...
Hi, The baseline of two images of an area needs to be above 150 to generate a DEM from sentinel 1 images. it should not be less than 150 so we've used a number greater than 150. Also, in terms of the images period, it is important that the periods of two images with 150 baselines must be less than 6 months. So we can't use images that have a baseline greater than 150 and greater than 6 month time period. So in addition to the baseline above 150, the time periods of our images should be less than 6 months.
Hi, When I get to the Snaphu-unwrapping stage I am unable to open the dialogue box. When I am at the step shown at 22:20 the Snaphu unwrapping tool does not open. Can anyone help me to resolve this please?
Thank you for this video. I have gone through a problem in that my study area does not cover any bursts. So, what should be done? and if I do this analysis, it has been noticed that my location has been shifted from its original location.
Hello, have a good time Because our study area was in bursts 2 and 3 Because the images are not shared in the same scene and the goal was to extract the desired range
Thank you very much sir.. My question is can we do bathymetry mapping in the same way for inland lakes...or make depth mapping of lakes similar like dem..??
thank you so much for this awsome tutorial, and, is there a way to deal with the big size of the sentinel file, about 7 GB, i don't know if clipping to reduce the area of study affect the quality of the image .
Hi Thank you No, cropping the image does not affect the quality, and you can crop the image you want due to the large size of the images and the heavy processing, and perform the processing on your own area.
I had a problem with the image registration Back-Geocoding step. Unable to generate the data and display: Java. Lang. NullpointerEXception. Can anyone help me to resolve this please?
Hi, The baseline of two images of an area needs to be above 150 to generate a DEM from sentinel 1 images. it should not be less than 150 so we've used a number greater than 150. Also, in terms of the images period, it is important that the periods of two images with 150 baselines must be less than 6 months. So we can't use images that have a baseline greater than 150 and greater than 6 month time period. So in addition to the baseline above 150, the time periods of our images should be less than 6 months.
@@rsgis6997 For example, from the two-week image found in August for glacier studies; Can we produce digital elevation models between August 18, 2015 and August 30, 2015? There is no data that meets 150 criteria as you did in the video.
Hi, thank you for the video, it is really good. However, I can not install the SNAPU unwrapping, it dose not work, and I did everything like you said. What could be the problem?
Have you placed the installation folders correctly? You can take a picture of the problem you have on the SNAP site and explain it so that it can be solved
Hello Sir, I tried the tutorial but I'm stuck at the unwrapping process. I got the output in .img format but it didn't show in the product explorer and when I tried to open it with SNAP It is unable to shows. Can you please enlighten me Sir?
Hi, it probably has something to do with your RAM. Java uses much of the RAM so it has to be upgraded to a higher one. if you can, increase the cache size of your RAM and try again.
Hello, I hope you can help me, when I try to do the S-1 Enhanced Spectral Diversity step, an error in showed in the software processing: Generated network of images does not contain any pair. Max temporal baseline provided: 4. How can I move forward in the processing? Thank you very much!
Hello To solve this problem, you can enter the link below And search the title of the problem to display solutions provided by friends If there is no solution, you can ask the problem in a question by sending a photo forum.step.esa.int/
If you're using only one burst, you don't need to use this ESD operator. Because it is used to adjust shifts between several bursts. Also changing your system language to English, especially changing time format is help for many processes.
Excuse me, when I clicked download button, another screen appeared and reported that "Product unavailable. The retrieval of offline data is temporary unavailable, please try again later". What should I do then?
Hello If you can, place an order request so that the offline image will be online for you as soon as possible so that you can download it What date is the picture you want for?
@@rsgis6997 thank you so much for your answer. I want pictures for date 20 and 26 Feb 2021. I don't know how to get that GRDF format. When I click download bottom, it is automatically downloaded in Zip format.
Hello So that we can get the right images in terms of a series of features that have a direct impact on the output of our processing We select the appropriate images with the help of the baseline tool Then in Copernicus you download the specified images
HI! What is the difference between elevation and elevation_VV?And i found that my elevation and elevation_VV vary greatly .Is this a reasonable phenomenon？thank you verymuck！
@@rsgis6997 what do you mean elevation is a different digital model and ele_vv is from sentine_1, aren't they all generated from the two sentine_1 images downloaded from copernicus?
@@rsgis6997 is it ok to proceed with less than 100m ?. im going to process the data somewhat dry area. ( dem for nearly 400sqkm). And how is the accuracy of this dem compared to SRTM 30m dem.
Hello. I am trying to unwrap the phase in SNAP and it is getting unwrapped but later SNAP import is not working. Even after the execution of Snap unwrapping, the output folder is not getting formed , I don't know why. Can you help me with this please ?
Hello sir, in the vertical criteria, if I have a period of 12 days but in the two images I have a criteria of more than 160 but less than 180, is it valid to use these two images?... by the way, good tutorial
@@rsgis6997 Did you mean we cannot use sentinel 1 for generating DSM for Urban area or forest area? If so, could you please let me know the reason? Many thanks in advance.
@@soknethlim3387 Yes, that's correct You can use it but it will be less accurate We explained the reason in full in the first video Watch the first part of the video
@@rsgis6997 muchas gracias .... seguiré todos los pasos... quiero monitorear los cambios que ocurrieron en una zona aquí en Perú... y 13.9 metros es para mi excelente
After Back geocoding and while carrying out enhanced spectral diversity, an error occurs as: A problem occured during the target product processing. Type: OperatorException Message: Generated network of images does not contain any pair. Max temporal baseline provided: 4 Can you please help me on that?
Hi sir, unfortunately we haven't processed or worked with the GPR format, sorry about that. Hope you can find helpful information from this GitHub Link: github.com/emanuelhuber/RGPR
An Absolute Beginner's Guide to SNAP (Thorough Tutorial) - SeNtinel Application Platform
ruclips.net/video/IqqH4UEVGmY/видео.html
How to put geographic lat/lon projection elevation dem at snap? There's a gap at 30:06 . just figure out, do not change WSG 84 (keep it default) and allgo the rest is exactly how it should be. Thank you for the video.
thank you for this (once more) amazing tutorial!
Thank you very much
for your kind opinion
Thanks for your video. I would like to know why we used two images to do this. And I would like to compare two days' dem(before and after rain). How could I complete this goal? Should I use two days' images to form A, and then use another two days' to form B?
You can download the history of the images in two series of images.
How can I merge two overlapping DEMs that are generated from the process that was shown in the video? Half of my study area is in IW1 and half in IW2, so I need to merge those.
Thanks for the video, everything is very clear. I have a problem, when I select the selected file at 22.52 into the video, I get an error with the GDAL product reader. How can I fix this?
Hi there, thanks for the video, it is indeed a good method for areas without dem data.
After I studied and followed the steps, and read the comments, I have already know this method is not applicable for urban and vegetation areas, this is a pity.
My goal was to generate the latest and accurate-to-a-certain-extent (within 30) dem for my AOI, since you know, most of the publicly-available dem data were from like 10 years ago.
Apparently this method is not going to help me with my goal, but I do have a few questions:
1. what is the actual resolution of such a generated dem and how can you check this? With the pixel size?
2. how do you cover your AOI during the spit and burst step? In the video you can see that the burst grids only cover part of the red square, right?
3. I generated a dem by following the video and exported the tiff files, but when I compare it with the srtm dem, there is a very big difference on the band values, espeecially the band values, the generated dem has values on band 1, 2 and even 3 and 4, but the srtm only has band 1, how so?
4. Do you happen to know any other way to help with my goal? I could really use some of your professional experiences on this 🤣🤣
Looking forward to your replies and thanks in advance 🙏.
Hello, good time
You can enter the following site to get answers to your questions
Ask your questions here
forum.step.esa.int/
Thanks for this tutorial
You're welcome 😊
Hello, Data dated 2019/06/16 and 2019/09/26 were used for DEM formation. What is the date of the created DEM data? Thanks.
Hello
Same time frame used
Good afternoon, How can I use the elevation information points(gcps) instead of using the srtm1sec model to create a DEM from the sentinel1 data
thank you for the video, but I have a problem whit the S-1 TOPS Split, because when I run the analysis appears this error:" SOURCE PRODUCT SHOULD BE MULTI SUB SWATH SLC BURST PRODUCT". What I do to solve this problem?
thanks a lot
you're welcome
What image format did you download Sentinel-1?
SLC or GRD?
Hi there
Thanks for the video
Why do we choose the basic criteria in the negative (-) direction?
Also why do we choose the closest vertical criteria?
Why is there no vertical criterion in the minus (-) direction in a sentinel image dated Oct 04, 2014?
Thank you for your time ...
Hi, The baseline of two images of an area needs to be above 150 to generate a DEM from sentinel 1 images. it should not be less than 150 so we've used a number greater than 150. Also, in terms of the images period, it is important that the periods of two images with 150 baselines must be less than 6 months. So we can't use images that have a baseline greater than 150 and greater than 6 month time period. So in addition to the baseline above 150, the time periods of our images should be less than 6 months.
Hi, When I get to the Snaphu-unwrapping stage I am unable to open the dialogue box. When I am at the step shown at 22:20 the Snaphu unwrapping tool does not open. Can anyone help me to resolve this please?
Hello
Are you getting an error?
What exactly is your problem?
Did you proceed according to the instructions?
very nice. I learn a lot with this.
Glad it was helpful!
Export View as Google Earth KMZ; at this stage i get an error "Product must be in Geographic Lat/Lon projection". Am I missing anything?
Thank you for this video. I have gone through a problem in that my study area does not cover any bursts. So, what should be done? and if I do this analysis, it has been noticed that my location has been shifted from its original location.
hello
thank you
Unfortunately, I can't think of a solution
Try to select IW2 or 3 instead of 1.
disculpe , en el proceso de unwarpping , al direccionar el producto img, menciona que no se pudo leer :( , pero si lee el HDR
In this section (20:00 - Snaphu Unwrapping
) Do you have a problem? Did you do it exactly on the basis of tutorial?
Thank you for the tuto,
My question is why you chose bursts 1-2 in the 1st image then you chose bursts 2-3 for the second one?
Hello, have a good time
Because our study area was in bursts 2 and 3
Because the images are not shared in the same scene and the goal was to extract the desired range
Hellow, Thank you so much for your reply. well-done
you're welcome
Good luck
If you have any questions regarding channel videos, thank you for asking @@ammarizakaria6813
Thank you very much sir..
My question is can we do bathymetry mapping in the same way for inland lakes...or make depth mapping of lakes similar like dem..??
Using the link sent, you can find the related training to work with the item you mentioned
I haven't done anything for the lakes yet
step.esa.int/main/doc/tutorials/
Hi, What should I do if when I was trying to do the step of Orbit File, a message apears "a problem occured during the target product initialisation"?
forum.step.esa.int/t/a-problem-occured-during-the-target-product-initialisation/5064
Go to the SNAP site and write down your error, solutions are suggested to fix the problem
thank you so much for this awsome tutorial, and, is there a way to deal with the big size of the sentinel file, about 7 GB, i don't know if clipping to reduce the area of study affect the quality of the image .
Hi
Thank you
No, cropping the image does not affect the quality, and you can crop the image you want due to the large size of the images and the heavy processing, and perform the processing on your own area.
Hello, how did you add the scale in google map please?
The scale is automatically added with the output.
I had a problem with the image registration Back-Geocoding step. Unable to generate the data and display: Java. Lang. NullpointerEXception. Can anyone help me to resolve this please?
Please what s the difference between DEM and elevation from Sentinel1
Here DEM is a digital terrain model extracted from SRTM or other
Hi! Thank you for this. I cant export to Google Earth bcs acording to the SNAP it muts be in "Geographic Lat/Lon" projection. Any solution?
HELLO!I met The same question. How do you solve it?
@@youngoscar-n1h roll back to the last step and choose wgs84 DD for projection.
How did you determine the 152 vertical criteria in the video?
Do you have any suggestions for vertical criteria in studies?
Hi, The baseline of two images of an area needs to be above 150 to generate a DEM from sentinel 1 images. it should not be less than 150 so we've used a number greater than 150. Also, in terms of the images period, it is important that the periods of two images with 150 baselines must be less than 6 months. So we can't use images that have a baseline greater than 150 and greater than 6 month time period. So in addition to the baseline above 150, the time periods of our images should be less than 6 months.
@@rsgis6997 For example, from the two-week image found in August for glacier studies; Can we produce digital elevation models between August 18, 2015 and August 30, 2015?
There is no data that meets 150 criteria as you did in the video.
@@mucahitdal8707 Yes, you can in terms of time, but these two images must be higher than 150
@@rsgis6997 Thank you
@@mucahitdal8707 👍🌹
Hi, thank you for the video, it is really good. However, I can not install the SNAPU unwrapping, it dose not work, and I did everything like you said. What could be the problem?
Have you placed the installation folders correctly?
You can take a picture of the problem you have on the SNAP site and explain it so that it can be solved
forum.step.esa.int/t/snaphu-unwrapping-plugin/13456
Very nice and informative. can you share the spatial resolution of the DEM?
Yes, sure
Thank you for the tutorial. Just wanna make sure at what resolution this DEM is Sir?
The accuracy is 13.9 meters at the best condition
@@rsgis6997 thank you!
Hello Sir, I tried the tutorial but I'm stuck at the unwrapping process. I got the output in .img format but it didn't show in the product explorer and when I tried to open it with SNAP It is unable to shows. Can you please enlighten me Sir?
How would you export the digital elevation data?
One of the methods of DEM extraction is the use of Sentinel 1 images
You can see the training video
Well done Sir, please what is the difference between elevation and elevation_VV?
VV elevation is the image output, but the elevation is downloaded from the site
@@rsgis6997 do you mean the elevation data was already in the sentinel-1 images? Everything we did in SNAP were just extracting and visualizing it?
Can you upload video tutorial for mosaic sentinel 1 images?
Hi, surely we will, it will be created & Uploaded in no time
Mosaic Sentinel 1 images in the SNAP
ruclips.net/video/LVrvhlPzfzs/видео.html
Hi I’m running into a Java heap error in the back geocoding step. Pls help
Hi, it probably has something to do with your RAM. Java uses much of the RAM so it has to be upgraded to a higher one. if you can, increase the cache size of your RAM and try again.
Hello, I hope you can help me, when I try to do the S-1 Enhanced Spectral Diversity step, an error in showed in the software processing: Generated network of images does not contain any pair. Max temporal baseline provided: 4.
How can I move forward in the processing?
Thank you very much!
Hello
To solve this problem, you can enter the link below
And search the title of the problem to display solutions provided by friends
If there is no solution, you can ask the problem in a question by sending a photo
forum.step.esa.int/
If you're using only one burst, you don't need to use this ESD operator. Because it is used to adjust shifts between several bursts. Also changing your system language to English, especially changing time format is help for many processes.
Excuse me, when I clicked download button, another screen appeared and reported that "Product unavailable. The retrieval of offline data is temporary unavailable, please try again later". What should I do then?
The products became available now but the file is too large, more than 4 GB. May I ask whether it is possible to get only area of our interest?
Hello
If you can, place an order request so that the offline image will be online for you as soon as possible so that you can download it
What date is the picture you want for?
You can download images in GRDH format that have a size of 1 GB
@@rsgis6997 thank you so much for your answer. I want pictures for date 20 and 26 Feb 2021. I don't know how to get that GRDF format. When I click download bottom, it is automatically downloaded in Zip format.
@@soknethlim3387 Its right
The same ZIP format is the image that you need to download
There are images inside this zip file and you can use them
good afternoon, do you provide any tutorial for converting 30m resolution DEM into a high resolution DEM of atleast 10m resolution?
Hello
We do not have training to convert the accuracy from 30 meters to 10 meters
But by using some sources you can download with 12.5 meters accuracy
hello, can we have the dem in 10 m resolution/or say 30 m resolution? would that be correct accuracy-wise?
Hi, in terms of accuracy, the best DEM is 12.5 meters.
What about multilooking???
Multilooking reduces speckle and decreases the spatial resolution.
Is this a resampled dem resolution or actual?
very good
Thanks
Hi, what is the difference between downloading it directly from the baseline tool vs copernicus?
Hello
So that we can get the right images in terms of a series of features that have a direct impact on the output of our processing
We select the appropriate images with the help of the baseline tool
Then in Copernicus you download the specified images
@@rsgis6997 ahhh okay! Thanks so much for the quick reply 🙏
you're welcome
Good luck
If you have any questions regarding channel videos, thank you for asking@@danicavanschalkwyk5208
HI! What is the difference between elevation and elevation_VV?And i found that my elevation and elevation_VV vary greatly .Is this a reasonable phenomenon？thank you verymuck！
Hello
Yes, there is a difference
Elevation is a different digital model
But vv is a model extracted from Sentinel 1 image
@@rsgis6997 what do you mean elevation is a different digital model and ele_vv is from sentine_1, aren't they all generated from the two sentine_1 images downloaded from copernicus?
Excuses me again, may I know what the difference between elevation and elevation_VV is?
Elevation is a ready-made model, but ElevationVV is a model that we extracted from Sentinel 1 images
hello, for sri lanka maximum is 100. how to find greater than 150 image. please tell me
It depends on your region
Some areas are more and some are less
Dry areas are mostly higher
Is Sri Lanka a dry region?
@@rsgis6997 is it ok to proceed with less than 100m ?. im going to process the data somewhat dry area. ( dem for nearly 400sqkm).
And how is the accuracy of this dem compared to SRTM 30m dem.
@@mindibandi487 It is better than the tail of 30 meters
you can work
not clear where/how the Orbit File was retrieved
sir, i got stucked at the Co-registration S-1 Back Geocoding, idk whats wrong and how to solve it
forum.step.esa.int/
Search the problem on the following site to find the solution
The apply orbit process shows an error as no valid orbit file was found for 20 Sep 2022, please suggest me a solution
Do you tick the command?
Hello Sir, what if the values of baseline are in negatives?
Hello
It is better to be exactly based on the video description to be more accurate
Hello. I am trying to unwrap the phase in SNAP and it is getting unwrapped but later SNAP import is not working. Even after the execution of Snap unwrapping, the output folder is not getting formed , I don't know why. Can you help me with this please ?
forum.step.esa.int/
Search the problems you have in the following site to see the solutions provided
Thanks for Replying. I did every possible thing mentioned in that site earlier but nothing worked.
Hello sir, in the vertical criteria, if I have a period of 12 days but in the two images I have a criteria of more than 160 but less than 180, is it valid to use these two images?... by the way, good tutorial
Hello
you're welcome
Yes, you can use it
It must be above 150
You did it on bare land with less vegetation. how about on densely vegetated land?
No, it is not done on land with dense vegetation
@@rsgis6997 Did you mean we cannot use sentinel 1 for generating DSM for Urban area or forest area? If so, could you please let me know the reason? Many thanks in advance.
@@soknethlim3387 Yes, that's correct
You can use it but it will be less accurate
We explained the reason in full in the first video
Watch the first part of the video
@@rsgis6997 thank you so much for your response 😍
@@rsgis6997 OMG, then this application is really limited 😂😂
cual es la resolución del DEM generado?
The accuracy is 13.9 meters at the best condition
@@rsgis6997 muchas gracias .... seguiré todos los pasos... quiero monitorear los cambios que ocurrieron en una zona aquí en Perú... y 13.9 metros es para mi excelente
@@yamilcornelio3269 Buena suerte
asi que use el Hdr min 22:38
You need to create a new folder based on the video and adjust the parameters
Is Snaphu Export done for you?
@@rsgis6997 gracias , realice todos los pasos y si me salio, pero por favor como convierto ese archivo a formato tiff y luego a curvas de nivel
@@yamilcornelio3269 El archivo de salida es Tif.
Para generar líneas de contorno
Debes hacer esto en otro software como ArcGIS o QGIS.
very very good
Many many thanks
can we get the output file as tiff file?
yes
After Back geocoding and while carrying out enhanced spectral diversity, an error occurs as:
A problem occured during the target product processing.
Type: OperatorException
Message: Generated network of images does not contain any pair. Max temporal baseline provided: 4
Can you please help me on that?
@@sushantanepal Do you choose the Digital Elevation Model correctly? And did you do the previous steps exactly like the video?
👍🌹
🙏
Habrá alguna manera de contactarme con uds , numero de celular correo?
Hello, yes, there is an email address
remotesensingandgis2022m@gmail.com
Like
🙏🙏
Convert Sentinel 1 radar image from grd to gpr format
Hi sir, unfortunately we haven't processed or worked with the GPR format, sorry about that.
Hope you can find helpful information from this GitHub Link:
github.com/emanuelhuber/RGPR
Thank you for this tutorial
You're welcome 😊