The map-algebra tag has no wiki summary.
2
votes
1answer
39 views
Nearest Neighbor Focal Statistics and Map Algebra
I would like to use a nearest-neighbor type analysis to iterate over a raster. The nearest neighbor analysis will give a cell value of 1 IF AND ONLY IF the cell being analyzed has a cell value larger ...
1
vote
1answer
125 views
ModelBuilder: How2 pipe output of Iterate Raster tool into Raster Calculator tool?
Re: ArcGIS v10.1 ModelBuilder
Hello,
THE PROBLEM:
Using ModelBuilder and map algebra, I want to compute a ten year average grid from a stack of 10. The problem is that only 1 grid (%raster%), the ...
5
votes
1answer
130 views
Error using con in Map Algebra in Python script
I am experiencing a painful problem in the middle of a Python script I am writing. When I get to a Map Algebra function, I have tried two different options and both return a different error.
At first ...
1
vote
2answers
101 views
How to produce a mean raster file based on other raster files? [duplicate]
Possible Duplicate:
Tools to flatten the jp2 to a single band (average the bands)?
I have a number of raster files from a same area, that coordinates of corresponding pixels perfectly match ...
1
vote
0answers
104 views
Map Algebra in VB.NET Add-In Tool
I'm trying to run a map algebra expression in a vb.net add-in, and can't seem to get it to work. It's a roving window that interpolates noData areas in a DEM. The expression works in the Python ...
5
votes
2answers
923 views
Using individual bands from a multi-band image in ArcGIS 10 raster calculator
I'm trying to use individual bands from a multi-band TM image (IMG file) within the raster calculator in ArcGIS 10 (SP2/3). I can add individual bands to my MXD, but raster calculator will only use ...
1
vote
0answers
149 views
How can I ignore NoData values in map algebra?
I need a way to exclude NoData from calculations. I don't want any NoData cells from any of the rasters to be used in pick or con statements.
2
votes
1answer
317 views
Spatial Analyst tool Look up but in ArcView3.2
Is there any option how to do a Spatial Analyst tool "Look up" operation from ArcGIS 10 in ArcView 3.2?
I have a grid with attributes and need to "extract" values from the table field (values from ...
7
votes
3answers
389 views
How do I create a raster randomly choosing a cell value from 2 or more overlapping rasters?
I'm using Arc 10. I want it to combine multiple rasters into one, always choosing randomly from the values of overlapping cells. I have an image that may explain this better:
3
votes
1answer
257 views
Change raster value for an area based on a class of another raster
I would like to change all raster values in raster A that fall into the locations of category/class 1 of raster B.
Here, some more details. I did a calculation on a DEM resulting in different ...
4
votes
2answers
1k views
For Loop - Map Algebra (ArcGIS) using Python
ORIGINAL QUESTION
Im relatively new to python and these fourms but Im am having trouble utilizing for-loops for spatial analyses within ArcGIS. It does not appear to recognize the variable, ...
3
votes
4answers
517 views
Compressing map algebra outputs from ArcPy
When creating a raster map algebra output, is it possible to set its compression? I'm creating a model which generates many hundreds of rasters, and currently each is being stored without any ...
7
votes
1answer
540 views
Partially update a raster (a DEM)
My todays question is: How to update an .img DEM in ArcView 9.3?
I do have DEM which need to be updated only if few parts. The area to be updated has been produced in separate DEM with Spline ...
11
votes
4answers
277 views
What are some Domain Specific Languages (DSLs) for GIS?
I'm curious what sort of domain specific languages (DSLs) are used in GIS. The only one I can think of is the DOCELL language that was provided in ArcInfo Workstation GRID, but is no longer ...
21
votes
8answers
2k views
What raster-based GIS systems really work?
Raster GISes like GRASS, ArcGIS/Spatial Analyst, and Idrisi can perform a rich set of data processing and analytical procedures loosely known as "map algebra." In today's computing environment it is ...
