Take the 2-minute tour ×
Geographic Information Systems Stack Exchange is a question and answer site for cartographers, geographers and GIS professionals. It's 100% free, no registration required.

Does anybody have any experience with plotting Smith & Sandwell 2-minute Mercator-projected grids in ArcGIS? I've downloaded one in two formats: ers and img. I've found tools for processing .img data called Generic Mapping Tools (GMT). Within this library there are commands which allow manipulating img grids, which is just what I need. This example uses the img2grd command which I can't find within the GMT library. The only tool I found so far was img2mercgrd but it wasn't successful.

I would be grateful if there is anybody who can give guidance in how to process this dataset to GIS format.

share|improve this question
1  
Exactly how did img2mercgrd fail? –  whuber Apr 6 '12 at 21:30

1 Answer 1

GDAL to the rescue!

Try to make use of the utility gdal_translate

gdal_translate -of AAIGrid input.img output.grd
share|improve this answer
    
SaultDon,Thanks for your suggestion. I actually managed after all to get the .grd file out through Cygwin library. However the problem is with processing with the actual dataset - it is in a spherical Mercator projection which is tricky to work out in ArcGIS. I work with topo11.1 img (+.ers) dataset version. So the next step is to work it up into a correctly projected and valid GIS format. Any suggestions??? Many thanks! –  Magda Mar 29 '12 at 8:26
    
So you are looking to reproject the data? Try searching the stackexchange for those questions (keywords: project spherical mercator - for example) and see if someone has a similar case to yours. If not, you may be able to post another question. –  SaultDon Mar 29 '12 at 16:41

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.