Spatial Analyst is a extension within ArcGIS that provides a range of spatial modeling and analysis tools.
4
votes
0answers
63 views
How to calculate the volume of several DEMs to obtain elevation and volume changes?
I am trying to calculate the volume of several DEMs in order to obtain elevation and volume changes. I have pixels of 1x1 each one associated to an elevation. I used several methods but non of them ...
2
votes
2answers
48 views
What tool would you use to “clip” a vector line file to a vector polygon file?
I am trying to select the use of a large vector line file within only the parameter of a vector polygon file to do spatial analysis. It would be the same thing as using the extract> clip tool under ...
2
votes
0answers
52 views
ArcGIS Raster Calculator VS QGIS Raster Calculator
Are there any major differences between ArcGIS Raster Calculator and QGIS Raster Calculator?
3
votes
1answer
42 views
Why is my simple arcpy script failing? (sets raster cell value to null if below threshold value, ArcGIS 10.1)
As mentioned in the title, simple script to set null cell values below three standard deviations beyond the mean:
import arcpy, sys, os
#Accept input and output raster
inRas = sys.argv[1]
outRas = ...
0
votes
0answers
14 views
Limiting the maximum and minimum values of an interpolation surface tool (ArcGIS, Spline)
I've been using the spatial analyst spline tool in ArcGIS 10.1 and was wandering whether it is possible to limit the maximum and minimum values to those of the z-attribute.
Currently the spline will ...
0
votes
1answer
40 views
Error while creating a slope [duplicate]
I have a elevation raster (1 arc second) downloaded from USGS site. Before adding it to ArcMap I changed the display units to meters.The projection system for this raster is GCS_1983. When I use the ...
1
vote
2answers
44 views
Round Raster to next higher or lower int
I am using ArcGIS 10.1.
I am searching for a solution to calculate a raster.
The values are like:
0.2
0.6
5.3
i.e.
How can I now get 0.2 as 0 and 0.6 to 1 and 5.3 to 5? In the end integer numbers.
...
2
votes
1answer
60 views
About regression analysis in arcgis
I'm trying to do regression analysis using a shapefile which contains dependent variable (NDVI) and explanatory variable (prec) in Arcgis. First, I run GWR analysis and then run spatial ...
2
votes
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 ...
0
votes
1answer
45 views
Elevation Drop Along a Stream [duplicate]
Previous discussion
In reference to a previous discussion, suppose I want to cut the stream every 100 m and find the elevation drop every 100 m. How can I do this?
2
votes
0answers
48 views
Is there any method to analyze data from fire protection events ?
I want to analyze data from events in fire protection a create some illustration of maps.
In short: my task is to find methods for data visualization. Data are represented by point layer (each event ...
1
vote
2answers
97 views
“Extract by Mask” changing raster pixel values…or not?
I am using ArcMap 10.0 and am confused by my Extract by Mask output rasters.
I hope to eliminate the black background from three Landsat ER Mapper images so that I can mosaic them. Originally I ...
-4
votes
1answer
60 views
find the nearest neighboring polygon
I have an assignment where I will find the nearest neighboring polygon. For example, if the polygon has one neighbor 2.3 and 4, I also find the neighbors of the polygon 2,3 and 4.
0
votes
1answer
35 views
IDW: Default Maximum Distance and Coincident Points
The ArcGIS Help file says the Default Maximum Distance, when using the Variable Search Radius in IDW, is the extent's diagonal, however, no value is automatically filled in the corresponding box after ...
1
vote
2answers
48 views
How can i use field of view in ArcGIS?
The field of view analysis in GIS is a polygon file that shows the portions of an area that are visible versus no visible across a terrain starting from a given point. see this Link
How can I use ...
