A tool in some GIS software programs for performing algebraic operations on rasters.

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Error while using raster calculator in model builder

I am trying to use the model builder for the RUSLE Model. Well this is how the model looks like: So in the raster calculator I have a formula which also involves the rasters generated in the model. ...
2
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0answers
52 views

ArcGIS Raster Calculator VS QGIS Raster Calculator

Are there any major differences between ArcGIS Raster Calculator and QGIS Raster Calculator?
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1answer
38 views

How to exclude some parts of raster classes based on size of area?

I have a raster file with 5 classifications. I've calculated area for all of the classes via Zonal geometry, Arcmap 10. Now, I want to exclude patches which are smaller than 100 sq. km. and ...
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2answers
43 views

How to use Raster Calculator in ArcGIS 9.3? [closed]

Raster Calculator tool is not available in ArcGIS 9.3 , so how to do in 9.3.??? thanks in advance
2
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1answer
35 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
56 views

Copy and Paste symbology in Raster?

Hi all, I am trying to figure it out how can I take a preserved color from a raster I already set up before and then apply the colormap to a new raster file? Here are the details of what occurred: ...
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1answer
23 views

SAGA, GRASS Raster values to null

I want to make the cells which values "1" to null in QGIS with Grass or Saga tools (exactly Saga).
2
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1answer
67 views

I need help entering a formula into the raster calculator

i have the following formula: L = (l/22,1)^m (l = Flow length) m is calculated like this: m = 0,5 when slope is >4 degrees m = 1,2 * sin^1/3a when slope is <4 degrees (a = slope in ...
2
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1answer
70 views

Scale raster in ArcGIS using raster calculator

I have a raster with values ranging from 0 to 8991130624. This raster is actually the result of a cost distance analysis. I want to scale the raster to range from 0 to 1 and take the inverse? so ...
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1answer
69 views

How to evaluate raster calculator expressions from the console?

How can I execute from the console an expression that should be used with the raster calculator? I'm searching for something like this: qgis.someRasterCalcClass.evaluate("boh@1 + boh@2", ...
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1answer
99 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 ...
3
votes
3answers
88 views

query raster cell values by point

I have a binary raster (0s and 1s) that I need to query given a set of point coordinates. This is easy enough to do with gdal (gdallocationinfo), but where it get's complicated is that I also need to ...
7
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1answer
127 views

Calculating distance from points to different class in raster

I am looking for some advice on how to calculate the distance from a point to a different class of a raster. Specifically, I have observations (points) of animal use overlaid on land cover data. For ...
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0answers
27 views

Isolate And Save Raster Features From Existing Multivalue Raster Map

I have Cyprus Corine map with 44 different types of land use. I want to run a raster calculator query or any other way to isolate the areas with codes 10 to 22 and 26 to 34, all other values 1 to 44 ...
3
votes
1answer
165 views

How to standardize raster output from 0 to 100 using raster algebra?

I am working on generating an integrated moisture index based on the following equation: IMI = (hill shade * 0.5) + (curvature * 0.15) + (flow accumulation * 0.35) Iverson et al. 1997 Another ...

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