5 replies to this topic

[bebe onea]

Hello, I'm new to GIS world and I'm trying to clip a SRTM grid obtained here http://seamless.usgs.gov/ based on a clipping mask which is a shape polygon with the raster calculator in ArcInfo 9.2 and I'm getting the following error "error in executing grid expression" . Can anyone help me with this please?
Thanks a lot.

Edited by bebe onea, 26 February 2007 - 03:54 PM.

[Andrew]

Hi there,

I have been clipping SRTM tiles lately aswell, but I have been using a different method. Instead of writing an expression in the Raster Calculator to clip my raster I have been using a script from the esri support site called "multi bands raster clipper". Multi Bands Raster Clipper, (follow link to access script) can clip an image based on a user defined polygon, a user defined area by digitising, or just drag a box over the area of interest.
Has instructions on how to implement, and are quite easy to follow.
You still need Spatial analyst though.

I have found it quite handy and I hope you do to

Andrew

P.S Also I think Hawths tools can also help with this Hawths tools link

[Charlie Frye]

Hello, I'm new to GIS world and I'm trying to clip a SRTM grid obtained here http://seamless.usgs.gov/ based on a clipping mask which is a shape polygon with the raster calculator in ArcInfo 9.2 and I'm getting the following error "error in executing grid expression" . Can anyone help me with this please?
Thanks a lot.

One issue in this area that has bitten me a few times is that the polygon dataset you are using must not contain multi-part polygons. Use the Multipart to Singlepart tool to start, however, if there are any interior parts (holes), you'll need to edit the data to remove them.

[bebe onea]

The polygon I used it's just a simple rectangle. I simply use it to delimitate the area I'm interested in. I found a tutorial on the internet with this issue and it worked just fine there. But it did't work with my data.

[bebe onea]

Hi there,

I have been clipping SRTM tiles lately aswell, but I have been using a different method. Instead of writing an expression in the Raster Calculator to clip my raster I have been using a script from the esri support site called "multi bands raster clipper". Multi Bands Raster Clipper, (follow link to access script) can clip an image based on a user defined polygon, a user defined area by digitising, or just drag a box over the area of interest.
Has instructions on how to implement, and are quite easy to follow.
You still need Spatial analyst though.

I have found it quite handy and I hope you do to

Andrew

P.S Also I think Hawths tools can also help with this Hawths tools link

Thanks a lot.

[merft]

Two things I would check.

1) Make sure that the raster and the shapefile are in the same projection.

2) Make sure that all the files are in a file pathway without spaces or special characters. I usually process files in C:\workspace or C:\temp. Make sure that the filenames are short and don't have spaces or special characters.

-Tom