Spatial Analyst is a extension within ArcGIS that provides a range of spatial modeling and analysis tools.
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0answers
37 views
Future of Spatial Information Science [closed]
I have studied Software Engineering and worked 3 years as an Oracle Database Administrator and architect in ERP projects.
Recently, I decided to take a course(Master) and now I have received two ...
2
votes
0answers
36 views
Determine 3 and 6 minute fire response times
I'm expecting to get an Excel file with data on previous fire and emergency response times. I was told it will have incident addresses and the response time for each incident (~ 12K incidents). I also ...
0
votes
0answers
17 views
ArcMap 10.1 - Tabulate Area tool “doubling up” for Overlapping Buffer Zones
This question is related to a previous question I asked: Raster Version of Spatial Join (one to many)
I used the Tabulate Area tool to crosstabulate values between an overlapping "buffrast" raster ...
2
votes
1answer
44 views
Tabulate Area crashes Python and ArcGIS
I have a script that runs Tabulate Area on a single feature class multiple times with different rasters. In total Tabulate Area runs 5 times. 2 of the input rasters are provided as arguments to the ...
1
vote
0answers
27 views
Different results from Spatial Analyst GP Tool and Python
I am writing a script that has to subtract one raster from another.
The rasters I have represent
1) Parking Lots (1 = Parking Lot, 0 = not Parking Lot) and
2) a buffer around the Parking Lot (1 = ...
2
votes
2answers
32 views
Solar analysis; Are there any issues with splitting large DEM
I am trying to run Solar analysis in ArcGIS and it is an enormous DEM of a very mountainous region. I'm obviously going to have to split the DEM, but I was wondering if there are any issues with ...
0
votes
1answer
34 views
territory analysis
I want to determine the territories in which customers to a bank has the shortest path. It can be done with desktop software packages or programming if it is needed. Does anybody has idea on how to ...
0
votes
0answers
27 views
Explaining the output from ArcGIS' Principal Components tool
I have completed the process but am unsure whether I am interpreting the output like I should, particularly the text file. I am especially interested in the "EIGENVALUES AND EIGENVECTORS" portion.
0
votes
1answer
29 views
Global DEM and country borders
I am trying to split up the world into 2 categories based on elevation (below 2000m and above 2000m) while still including a country identifier. So in the end, I would like to have 2 types of units ...
0
votes
0answers
36 views
How specify a corridor minwidth?
I’m trying to make a corridor between two substations with ArcGIS, a macro corridor and a micro corridor.
I have two questions in this respect and would be grateful for your suggestions.
a) How can ...
1
vote
0answers
58 views
How to compare outputs of erosion from ArcSWAT and RUSLE from ArcGIS?
I calculated water erosion in ArcSWAT and I also calculated erosion by RUSLE
http://35.8.121.139/rusle/
equation in ArcGIS. Now I need to compare these two (from ArcSWAT I used SYLD- assumed ...
4
votes
1answer
76 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
0answers
45 views
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
votes
2answers
55 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
69 views
ArcGIS Raster Calculator VS QGIS Raster Calculator
Are there any major differences between ArcGIS Raster Calculator and QGIS Raster Calculator?
1
vote
0answers
29 views
Problems running zonal statistics - not all zones represented
I have been working on a Python script to automate the steps illustrated by whuber here:Create points around the edge of viewshed results
I am trying to create a horizon graph illustrating the ...
3
votes
1answer
55 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
20 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
45 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
47 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
67 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
40 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
48 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
51 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
119 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
64 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.
1
vote
1answer
40 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
50 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 ...
2
votes
1answer
43 views
Flow path between contaminant sources and exposure point
Hi I am trying to estimate flow paths between contaminant sources and the catchment offtake (exposure point) at the catchment.
Can anybody give me some help in how to proceed.
thanks
1
vote
0answers
49 views
Plotting time-series data in ArcGIS
I'm attempting to produce interpolated plots of water quality time-series data from ArcSDE. This is the data format:
OID WELL_ID WELL_NAME SAMPLE_ID SAMPLE_DAT PARAM RESULT
...
1
vote
1answer
92 views
Convert Heatmap into a Grid of Points
Question: How do you take a heatmap generated using a GIS software (arcgis, qgis...) and convert it into a uniform grid array of points which can be used to regenerate the heatmap (although with ...
5
votes
2answers
90 views
Is there a way to increase the search radius of nearest neighbors for the Nibble tool?
I am working with a raster map vegetation types. I have about 20 types with unique raster code values that can be sorted into three classes:
1 - vegetation types I want to expand using the nibble ...
3
votes
1answer
269 views
ArcGIS 10.1 ERROR 000824: The tool is not licensed in arcpy
I try to run the Zonal Statistic as a Table through arcpy and it gives me:
ERROR 000824: The tool is not licensed.
Here is the doc for the function: ...
4
votes
1answer
68 views
Sum raster data visible from given point, by proportion of view
I am wondering if there is a tool that does the following (preferably in Arc but other options considered).
Simple example: what proportion of the view from a given point on the landscape is occupied ...
4
votes
1answer
95 views
Raster Reclassify fails upon Completion in ArcGIS
When attempting to reclassify a raster in a student edition of ArcInfo 10, the program crashes without an error upon reaching 100%. The reclassified raster is written, but with no spatial info. I've ...
3
votes
2answers
145 views
Majority filter (minimum mapping unit) in ArcGIS with larger window size
I want to run the majority filter in ArcGIS with a window size of 4 or 5 i.e. greater than the default 3. Is it possible? Or some other command (or tool) which might help me achieve that?
thanks!
3
votes
2answers
138 views
Create hachures from DEM in ArcGIS 10.1
I have created contour lines from DEM and now I need to create hachures/bergstrich for them. I believe that spatial analyst should solve this, but I'm not used to it and I didint found any similar ...
5
votes
1answer
270 views
How to calculate the flood volume using a LiDAR DEM and a HEC-RAS floodplain polygon
I’ve got a vexing GIS analysis problem which is
conceptually fairly straightforward, but in reality more challenging to figure out….
Basically, I need to calculate the VOLUME of floodwater within a
...
4
votes
1answer
166 views
Work-around for slow processing times in ArcGIS 9.3 with Spatial Analyst functions
I am batch processing a large amount of distance functions (~50,000) using ArcGIS 9.3. In this version, using spatial analyst functions, it seems to be the case that users cannot parallelize processes ...
7
votes
1answer
138 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 ...
2
votes
2answers
63 views
How can I create contours of 0.1 or 0.2 instead of 1?
The default value is 1 and I have salinity values from 33 to 35 and therefore only contours 34 and 35 can be created with the contour interval 1... But I want it smaller so I can see contours 34.1, ...
1
vote
1answer
622 views
reclass, raster calculator
I'm trying to apply seperate equations for different land types. I have created a raster containing only the land type I'm interested in. I then reclassed the values to '0'. My plan was to use the ...
9
votes
2answers
341 views
How can I get weighted Flow Accumulation to deal with negative values? [duplicate]
here's one I haven't seen anywhere, to my surprise. I am trying to do something a little different with Flow Accumulation, which I would think has been attempted before, but it's stumping me for now.
...
2
votes
0answers
71 views
ArcMAP path distance function handling of polygon and raster inputs
I am using a path distance function to calculate distances from a set of source cells on a land use raster. Unfortunately, my land use raster and my other inputs have different cell sizes. The land ...
2
votes
4answers
117 views
Error When Trying to Run Slope Analysis Script
I have written a script which is supposed to loop through all the rasters in a folder and perform a slope analysis on each raster and save the results in another folder.
I keep getting the following ...
1
vote
0answers
146 views
Raster calculator error 000539 - cannot create weak reference to 'classobj' object
I was - like many times before - trying to clip a raster with the raster calculator (raster * 1 with shapefiles as mask). Now - the following error keeps popping up:
ERROR 000539: Error running ...
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votes
1answer
96 views
How to calculate cumulative mean in Arcgis
I'd like to get cumulative mean value from a multiband image (4 bands). How can I do it in Arcgis, ERDAS and ENVI?
Thanks in advance
1
vote
0answers
100 views
About zonal statistic function in ARCGIS
I calculated zonal statistic in Arcgis to get max/min value of each LC types. Broadly, LC image include forest, grassland, waterbody etc. But output max value of zonal statistic function give me 0.972 ...
1
vote
1answer
70 views
How can I multiply each band of multiband image by separate scalars?
I have an image with 5 bands.
I need to multiply each band of this image by different scalars one time
(I'm lazy to do it one by one) and then get multiband image as a output.
For example ...
1
vote
0answers
83 views
How to Create Multiple Start and Destination Cost Paths?
I have a suitability matrix which was created in model builder based on elevation data
and multiple start data points and end data points representing schools.
I'd like to link all the schools up ...
