Daniela_06 Posted May 14, 2013 Report Share Posted May 14, 2013 Hello everyone, I am going crazy with this orthorectification procedure. This is what i have. I have several satellite images TM and ETM+ from different years that i need to classify and the perform change detection techniques. This images are 30m resolution. UTM Zone 30N WGS1984. I also have gather 2 DEM 1 arc sec (approx 30m ) UTM WGS1984. I need to do a mosaic of this two DEM because together cover the area of each satellite images. But not exactly. This to DEMS together are only a portion of the area of each satellite image, but it covers the area that i need. (NOT ALL THE SATELLITE IMAGE IS NEEDED). 1. Do I have to reproject the mosaic DEM to UTM ZONE 30N WGS1984 first? 2. I am using ENVI 4.2 and I am doing an Automated Image to image registration. This generates automatic GCP in the DEM and relates this GCP to the Satellite image (Band 1 for example) 3. The table of GCP shows a error of 25.50m is this to much of an error? because the images are 30m. 4. I have done the registration with this values and obtain a quite similar image than the original. Can anyone tell me if my procedure is correct? If its not, can someone explain me step by step how to do an orthorectification. I have seen tutorials, but ENVI 4.2 does not have USGS images or Landsat satellites listed to do orthorectification as all the tutorial shows. I need a more step by step (orthorectification for dummies) Thank you very much, I am really losing my mind here. Quote Link to comment Share on other sites More sharing options...
Team_Evil Posted May 15, 2013 Report Share Posted May 15, 2013 Change you envi program to the v4.8 or v5..Download the rigorous orthorectification module -change the landsat image projection to the dem projection...(you can do this job on fly with envi) -Now you can use the tool to orhorectify your portion of satellite images... Quote Link to comment Share on other sites More sharing options...
geogeek28 Posted May 15, 2013 Report Share Posted May 15, 2013 Landsat data are already orthorectified as far as i know.. http://www.usgs.gov/newsroom/article.asp?ID=1425 1 Quote Link to comment Share on other sites More sharing options...
Daniela_06 Posted May 15, 2013 Author Report Share Posted May 15, 2013 I am using University software and cant download this module. I have ENVI 4.8 but the Rig. Ortho. module is not enabled or need a license. Any other procedure? Quote Link to comment Share on other sites More sharing options...
moawad74 Posted June 7, 2013 Report Share Posted June 7, 2013 (edited) both, dem and landsat data should be in metric system (utm).... Edited June 7, 2013 by moawad74 Quote Link to comment Share on other sites More sharing options...
swagata Posted December 5, 2013 Report Share Posted December 5, 2013 (edited) Help: I need to orthorectify a IRS-P6-LISS-IV standard imagery. As no RPC file is associated with the image therefore, in Erdas Imagine 2011 I went for the "Orthorectify without GCP" tab. Here I have chosen "Orbital Pushbroom" as geometric model. Here message is coming "Failed to get metadata for the image. Can anyone tell me where I go wrong?? Thanks in Advance. Edited December 5, 2013 by swagata Quote Link to comment Share on other sites More sharing options...
peralta2794 Posted December 7, 2013 Report Share Posted December 7, 2013 Use PCI Geomatics is very good for ortorectification. Quote Link to comment Share on other sites More sharing options...
Annjeand Posted December 7, 2016 Report Share Posted December 7, 2016 I'm getting the "failed to get metadata" error as well. In Erdas Imagine 2016. Doing the same procedure as Daniela_06 with SRTM30 and WV2 imagery. Quote Link to comment Share on other sites More sharing options...
Svenne68 Posted December 8, 2016 Report Share Posted December 8, 2016 I don't think your problem is orthorectification for what you want to perform. Before you can do classification and change detection you need to do: Convert DN to radiance Convert radiance to reflectance Then you can do NDVI, Classification, change detection, comparison etc. between sensors and temporal resolutions Quote Link to comment Share on other sites More sharing options...
fantomas Posted December 10, 2016 Report Share Posted December 10, 2016 I'm getting the "failed to get metadata" error as well. In Erdas Imagine 2016. Doing the same procedure as Daniela_06 with SRTM30 and WV2 imagery. Hi, This problem happens because, probably you don't have the metadata file , it's more or less like , the file where you have the info about your image. In the case of WV2, you could have a TIL file with another RPC/RPB file and i think that you could probably have a IMD file and of coarse the tiff file. Then the program had to read all this files to process your image correctly. I hope it help... Quote Link to comment Share on other sites More sharing options...
Arhanghelul Posted December 10, 2016 Report Share Posted December 10, 2016 Where do you have ERDAS 2016 ? Share a download link, please. 1 Quote Link to comment Share on other sites More sharing options...
kikxtreme Posted December 17, 2016 Report Share Posted December 17, 2016 Where do you have ERDAS 2016 ? Share a download link, please. Plz Share Erdas Imagine 2016 Quote Link to comment Share on other sites More sharing options...
whocares1980 Posted December 18, 2016 Report Share Posted December 18, 2016 (edited) Sorry thought it was a new post lol. Edited December 18, 2016 by whocares1980 Quote Link to comment Share on other sites More sharing options...
Annjeand Posted December 20, 2016 Report Share Posted December 20, 2016 (edited) Hi, This problem happens because, probably you don't have the metadata file , it's more or less like , the file where you have the info about your image. In the case of WV2, you could have a TIL file with another RPC/RPB file and i think that you could probably have a IMD file and of coarse the tiff file. Then the program had to read all this files to process your image correctly. Thanks, yes I've now realized that that is the problem. I have a number of WorldView images from Digital Globe. They are labelled as R1C1, R2C1 etc. and all end in P001. I have a metadata file (.imd) but only for P001 and not for each individual image. I have tried mosaicing all the WorldView images together to form a single file for P001 but am still having trouble reading the metadata file (error: Failed to getmetadata). I can view the metadata in ERDAS. Edited December 20, 2016 by Annjeand Quote Link to comment Share on other sites More sharing options...
fantomas Posted December 20, 2016 Report Share Posted December 20, 2016 Thanks, yes I've now realized that that is the problem. I have a number of WorldView images from Digital Globe. They are labelled as R1C1, R2C1 etc. and all end in P001. I have a metadata file (.imd) but only for P001 and not for each individual image. I have tried mosaicing all the WorldView images together to form a single file for P001 but am still having trouble reading the metadata file (error: Failed to getmetadata). I can view the metadata in ERDAS. Hi again, You could create a single file from all your R1C1, R2C1, etc... with gdal it's more or less like this gdalbuildvrt yourfile.vrt *.tif then export to a tif file (becareful it could be huge) gdal_translate -of gtiff yourfile.vrt destinationfile.tif (you give the name of your imd file with extension .tif) Then you could use the file in ERDAS... See you Quote Link to comment Share on other sites More sharing options...
Annjeand Posted March 1, 2017 Report Share Posted March 1, 2017 I found an easy solution. You need to use the .til files and import them into Erdas. This provides a step by step on how to do this - http://www.hexagon-solutions.com.cn/Libraries/Tech_Docs/WorldView2_Basics_and_ERDAS_IMAGINE.sflb.pdf Quote Link to comment Share on other sites More sharing options...
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