Tagged Questions

3
votes
1answer
359 views

In ArcGIS 9.3, how do I split a 3-band raster (.tiff) file and summarize the band values?

Using ArcGIS 9.3, I would like to make a new, single-band raster file that includes only one value: a summary of the three existing bands. The composite band is currently a composite .tiff file. ...
1
vote
1answer
133 views

How to merge different classes/clusters in one single raster in arcgis 9.3?

I've created a signature file with 8 clusters and performed an unsupervised classification. Later I have grouped values (spatial) classes together to form 4 classes I needed (in symbology) but that ...
3
votes
1answer
819 views

How to split a polygon into multiple small parts by grid

we delineated a river basin in shape file and generated a line-featured shapefile using Hawths tools. now our task is that we want to divide this basin into small polygons by gird in order to compute ...
1
vote
1answer
626 views

How to create a single depth contour line from a bathymetric raster?

I have bathymetric data (raster form) that I'm trying to tease out specific depth contours. For example, I would like to "create" the 150-m depth contour from the bathymetric data in the Gulf of ...
10
votes
1answer
362 views

Method to shade or overlay a raster map to reflect time of day and ambient light

I have a daytime raster of my study area. I have 20+ counters in the study area that count "stuff" with a timestamp. Using PyEphem I determined the type of ambient light for each collected data ...
3
votes
2answers
261 views

Need to clip raster based on field name in ArcGIS 9.3

Is there a way around for me to batch clip a raster using a field name to create output a raster layer ? Much like using Split tool but it is for a vector. How about that for the raster side ? Going ...
1
vote
2answers
161 views

Finding zones with nodata in ArcGIS 9.3

I have a DEM raster with some small and large areas of NoData. I also have a raster defining zones (the zones consists of a rectangular grid). I want to create a new raster marking the zones where ...
4
votes
2answers
282 views

What generation of the MrSID format is supported by ArcGIS 9.3?

This is probably old news to some, but I just learned that MrSID (.sid) files have different 'generations' of file formats - so there are MrSID Generation 2, Generation 3, and Generation 4 files. ...
2
votes
3answers
5k views

Raster to Shapefile (Polygon)

Have you experienced converting a polygon from raster? The raster dataset is a satellite image created from zonal statistics? The problem is when I was converting the raster to polygon errors came out ...
4
votes
3answers
1k views

How to clip raster image by the extent of each row in a shapefile with ArcGIS 9.3

I'm using Python to clip a raster image by each row in a shapefile with ArcGIS 9.3. I am hoping to end up with one raster image for each polygon row, clipped to the extent of the polygon row. ...
1
vote
0answers
510 views

Conversion to Raster issue in ArcGIS 9.3.1

Trying to convert a polygon to raster in ArcGIS gives me an error... I am wondering if there is another way around to do this? I am using ArcGIS 9.3.1. The error i am getting is number 9999 when I ...
3
votes
2answers
3k views

Combining Two Adjacent Raster Datasets

I am trying to figure out how to combine two adjacent rasters into one raster using ArcMAP 9.3.1. The problem I am having is that there appears to be a gap in the data. I would like to be able to ...
2
votes
3answers
762 views

raster not displaying below certain scale

i've clipped a raster in 20 smaller images and i can zoom in until 1:150 in the original raster but, in the smaller ones, when i go below 1:4000, the workspace goes blank. i'm working with arcgis 9.3 ...