Spatial referencing netCDF to Raster images

Question

Hello,

I'm fairly new to arcGIS and am trying to create some raster images from datasets of the ocean floor, showing how their depth has changed throughout time. I downloaded a series of text files from the earthbyte.org website and converted them to grid format (NetCDF files) using GMT using instructions on the readme. I then used used the "Make NetCDF raster layer" tool in Arcmap (10) to create a series of individual raster images, which worked fine.

The issue I'm having is how to spatial reference them. As far as I can tell from the website, the data should be projected in WSG1984, however the rasters I have just display as having an unknown projection. Additionally, I've tried to re-project the images to WSG1984 using advice from other forums, however, this hasn't worked.

I'd be grateful if anyone could give me some tips or point out where I'm going wrong.

Thanks,

Joel

louise_acou · Answer

I have this same problem as you. I can set the projection, but that doesn't help. The lat/lon of my data in the netcdf are in UTM, and I'm guessing this is part of the problem. I could easily find the coordinates for the corners but how would I apply these to do the "georegistering"?

JUSTINEFEDERICI · Answer

This post from years ago has saved me tonight! Thanks!

DavidAskov1 · Answer

Did anyone ever solve this? If so, please post a solution!

I used this process:

- Make NetCDF Raster Layer tool

- Copy Raster tool to GeoTIFF

- gdal_translate -co PROFILE=BASELINE in.tif out.tif       (strips all tags)

- created a TFW file and dropped it in the same folder

- manually defined the coord sys in ArcCatalog

As if this wasn't a bad enough workflow, as mentioned above, the define projection tool seems to have no effect. That means I have to do the last step manually in Catalog, and I'm trying to automate this.

Any ideas? thanks.