Questions tagged [spatial-analyst]
Spatial Analyst is an extension within ArcGIS that provides a range of spatial modeling and analysis tools.
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16 views
Attribute Table missing After Raster Calculator?
I want to remove zero value pixels from MODIS LST raster images and apply a moving window that can only substitute the missing values and leave the other original values with out alteration. I have ...
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0answers
63 views
What is the future of R in spatial data analysis science? [closed]
I am new to spatial data science and have some basic knowledge in ArcGIS and QGIS. I am considering to continue my PhD in spatial analysis related to agronomy; ex precision agriculture, predicting ...
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0answers
23 views
Getting gridded population to resolution of land cover?
I have a population data at census tracts level and an impervious land cover. Impervious land cover is of 30 m resolution and census tracts data stored as a vector. Is there any way that I can ...
1
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1answer
29 views
How to convert a raster to a array CSV file?
I have a raster file and I would like to convert it to an array and then save it as a csv file with using arcpy.
The reason is that I want to do some statistical analysis over each row and column in ...
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2answers
27 views
Replacing value of specific pixel using raster mask in ArcGIS Desktop?
I have two rasters: the first is a basin with all pixels values equal to 0. The second raster (mask) has a single pixel with value = 1. In fact, I need only one raster where all the pixels into the ...
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0answers
13 views
Grouping points by proximity [closed]
I am using ArcGIS 10.1, I would like to group my points (roughly 120 in one shapefile) according to the distance between them. I am new in this kind of analysis, so I would need some tips.
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16 views
Running Cost Paths with Overlapping Points?
I am running cost paths on a data set with 60k points which represent farms. About a third of these points have the exact same coordinate (points can often represent village centers where the farm ...
2
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1answer
19 views
Performing localized raster edits using ArcGIS Spatial Analyst?
I have a raster image of water depth, float point values 1-15, in a very small area some erroneous values are in the raster with values of 100 - 375. I'm looking for a repeatable work flow in ArcMap ...
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0answers
19 views
Extract Multivalues to Points giving Error [000000_12301899]?
I am trying to run Extract Multivalues to Points in ArcMap 10.6 but I am getting an error code 000000_12301899. Below is a screenshot from the Results dialogue.
Also here are the inputs. The DEM is ...
0
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1answer
72 views
Find cells with 3x3 window [closed]
I have a raster and need to only identify cells that are adjacent within a 3x3 window.
I tried various tools but without any success. My current cells are 1x1 and currently using ArcGIS.
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0answers
19 views
QGIS 2.12 How can I assign the attributes of the polygons of the layer A containing the geometry of layer B?
In other words, I have two shapefiles:
Layer A: not-intersected Areas (1 attribute: ID);
Layer B: Buildings (Several attributes).
I want to identified by the related ID attribute all the buildings ...
2
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1answer
15 views
Connect sub model to cell statistics
I'm working on a bunch of raster imagery using ArcGIS 10.6.
I have a several sub models consisting of iterations of raster files. Here's one of them, the other do the same but with different ...
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0answers
17 views
How calculates weights for Weighted Linear Combination
I am using ArcGIS 10.1, I would like to use the weighted linear combination for generating a suitability raster. I understood that firstly I have to reclassify the raster involved (in my case: slope, ...
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2answers
92 views
How to create a single raster based on the values of three rasters (Conditional)?
I have three rasters of soil granulometric fractions (clay, sand and silt), all in %. I want to make a single raster of the soil texture classes. For that, I need to make some conditionals (i. e.: ...
0
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1answer
40 views
Loop through a range of rasters and use tool output as input for the next tool run
I'm using the particle track tool and limiting it to a specific trackingtime. For each tool run, I want the rasters input (magnitude and direction) to change to the next rasters in the lists, and the ...
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0answers
20 views
NDSI Classification : Output Raster <empty>
I generated an NDSI image in GeoTiff format that have values ranging from -1 to +1 . Now, I want to classify the image using a threshold of 0.4 to classify it into Snow and Non Snow . For the same, I ...
0
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0answers
30 views
Add z value from point layer to vertexes on polyline layer
I'm trying to get my z values from my 3d point layer over to my vertex' on a 3d polyline layer, so I can have lines with slopes in 3d.
I've first done a spatial location by intersect to filter out ...
3
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0answers
32 views
Sampling list of rasters in ArcPy?
I've been trying several times to sample (Sample tool from Spatial Analysis ArcGis 10.5.1) a list of rasters to a location sample (also in raster format .tif).
Here's the code I've been using, and ...
1
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2answers
26 views
Interpreting Cost Distance Tool (ArcMap) results?
I have a raster data where pixel value of each cell represents the potential minimum travel time across the cell in old world. I need to find the minimum travel time of some points from Addis Ababa (...
0
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0answers
18 views
Matrix union in ArcGIS
How can I do matrix processing in ArcGIS or ERDAS Imagine?
l have two different raster images for change detection. Matrix join same code filed information.
In this video link already done matrix in ...
1
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1answer
54 views
Perform Radiometric Correction of Landsat images using ArcGIS Desktop
I need to run NDVI on a study area that is covered by more than one Landsat image.
The NDVI must also be run over numerous years using different Landsat sensors (eg: Landsat 7 Level 1, Landsat 4-5 ...
1
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2answers
27 views
Specifying which point buffers fall within a particualar land type (polygon)
I have a point buffer layer which represents tick occurrence and a polygon layer which represents landcover types (derived from Corine land cover). I want to define which point buffers (1km) fall ...
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0answers
3 views
Additional mask files
I used the tool "Extract by Mask" to clip a raster. It resulted in 5 tif images: mask, maskc1, maskc2, maskc3, and maskc4. What are the maskc1-4 files? They're large and I'd like to delete them if ...
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0answers
58 views
Spatial-analyst, detecting bad ones from good positions GPS coordinates with QGIS?
I'm curious if someone else has been thru this problem and how it was solved.
Many years back people marked the position manually on a map to get waypoints of for example electric wire connection ...
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0answers
22 views
How to create a surface layer from gridded point data of air temperature and Precipitation?
I want to aggregate monthly averages of temperature and precipitation over a 10-year period into weighted seasonal averages (DJF) for use in interpolation. I have downloaded Shapefiles for each month (...
0
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1answer
37 views
Cost distance tool to figure out shortest distance over water between 2 points
I have multiple points in a bay and I need to figure out the distance of each point to the nearest inlet, without going over land. I have been told to use the Cost Path or the Cost Distance tool but ...
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0answers
39 views
Using minus in water drainage model
I'm doing a lab and I'm trying to understand exactly why I'm using the tool "minus".
I have a raster which I'm calling "heights". I also have two rasters with water surfaces and watercourse. I have ...
0
votes
1answer
54 views
Using Zonal Statistics to determine percent forest cover in grid cells?
The basis of what I am trying to do is determine what percent of forest cover is within a set of 1x1 km grid cells in arcmap. I originally attempted to do this using fishnet, tabulate area tool, and a ...
0
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1answer
31 views
Line of Sight Analysis using Points and DEM
I have a DEM and a point feature class with the elevation value from the DEM as an attribute plus with x number of feet added to it representing a tower location.
I would like to do a line of sight ...
2
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0answers
24 views
Least cost path from visibility
I use ArcGIS 10.1 and I am dealing with viewshed and least cost path analysis. I would like to generate a path on the basis of a cost surface taking into account the viewshed data as indicated in the ...
2
votes
2answers
210 views
Fill sinks until a known value
I have a DEM and I want to fill every sink with a Value of 2 meter. If a sink is less than 2 meter, it is filled full and if it is bigger, it is filled until it reach 2 meter.
The problem is that ...
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0answers
43 views
Using tool “minus” in height model?
I'm doing a lab and I'm trying to understand exactly why I'm using the tool "minus".
I have a raster which I'm calling "heights". I also have two rasters with water surfaces and watercourse. I have ...
0
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1answer
31 views
Obtaining flow accumulation from negative elevations using ArcGIS Desktop?
I have bathymetric data extracted from INFOMAR ArcGIS grids.
Based on the data I am wondering if the fill, flow direction and flow accumulation tools work with negative elevations or if I have to use ...
0
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1answer
41 views
Finding difference between two rasters using ArcGIS Spatial Analyst?
I know how to find difference between two rasters with Spatial Analyst tools, but how to display attributes, for example differences between two Corine Land (2006 - 2012) rasters, how to see codes of ...
1
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1answer
16 views
Calculate mean of raster excluding values in ArcMap?
I want to calculate the mean value of a specific region a raster data layer (being a GeoTIFF file), using the Zonal Statistics as Table tool in ArcMap.
However, some of the values are faulty and ...
0
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0answers
20 views
Using spatial clustering or statistical tools for attribute data
I have a data-set of well test results with attributes like iron and manganese concentrations. What are the best tools to try and determine if there are any spatial trends for each attribute? I would ...
0
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1answer
37 views
How to create and empty SpatialLinesDataFrame in R
I need to create and SpatialLinesDataFrame with a predefined structure (9 fields). I'm performing a function over a list of shp which I want to append to this empty spatiallinesdataframe.
I already ...
0
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1answer
30 views
Running Maximum Likelihood Classification?
I'm trying to run a supervised classification on a landsat 8 (L8 OLI/TIRS COLLECTIONS LAND SURFACE REFLECTANCE ON-DEMAND) imagery. I created a signature file, then ran the Maximum Likelihood ...
1
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1answer
39 views
Coding Python about raster calculation for create a toolbox
I want to create a tool box in ArcMap. I wrote this code:
# Import system modules
import arcpy, os,sys
from arcpy import env
from arcpy.sa import *
# Set input raster
InputRaster=arcpy....
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0answers
21 views
Modification of Line Density using ArcGIS Desktop?
I am using ArcGIS Desktop 10.1.
I need to calculate Line Density for polyline vector but the "Search radius" option must be replaced by something like the Neighborhood option in Focal Statistics.
I ...
2
votes
1answer
24 views
Merging multiple rasters applying priority rules using ArcGIS Desktop?
I have three raster layers covering the same geographic area. I would like to merge them into a single raster layer. The layers have different levels of importance, so I would like the merge to move ...
1
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0answers
53 views
Geographic scale of model and covariate significance using ArcGIS Spatial Analyst and R?
A few months back I created a spatial logistic regression model of terrestrial skunk rabies in Arizona/Colorado/New Mexico/Utah. A link to the project can be found here (https://docs.wixstatic.com/ugd/...
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1answer
116 views
Is there a limit to the number of raster layers in Raster Calculator?
I have 16-day Enhanced Vegetation Index (EVI) images for an area across roughly 10 years. 244 images in all. I would like to average these over the time period to get an average EVI value.
Is there ...
0
votes
1answer
41 views
ArcMap “Polyline to Raster” output is empty greyscale raster
I have a polyline shapefile of streams that I am attempting to convert to a raster using the "Polyline to Raster" conversion tool. However, rather than outputting a raster with distinct stream pixels, ...
0
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0answers
23 views
SpatialAnalysisTools (GPServer) > InterpolatePoints missing class values
I have been working on generate results using InterpolatePoints tools and consume it in our Web Application using these request parameters:
{
inputLayer: featureCollectionObj,
field: "POP",
...
0
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1answer
29 views
Buffer zone, binary exclusion
I have a shapefile of 20 cities in ArcMap 10.
I need to position a sheep farm so that it is not within 2 miles of any of these cities.
So, I created a buffer, with 2 miles as distance.
I used the ...
2
votes
1answer
33 views
Zonal statistics on raster layers that intersect line
I have a line feature class of routes and a raster file with 12 unique values. I want to know how much cells of each value in the raster has that intersect with lines.
I've tried zonal statistics (...
1
vote
2answers
94 views
Replacing data in raster using condition?
I have a raster dataset in ArcGIS displaying altitude.
I want to replace all values < 8 with value 8.
Other values have to stay the same. How can I do this?
I tried raster calculator, but I don'...
1
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0answers
33 views
Using Path Distance to Calculate Total Accumulated Cost from Source to Destination?
I am looking to calculate the total accumulated cost associated with traveling from a source point to a destination point (please see the included figure below, green dot = source, red dot = ...
1
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0answers
24 views
Zonal Statistics as Table: Generic 99999 Error on Some Features [closed]
I'm running Zonal Statistics as Table on three separate feature classes. These feature classes represent travel walk bands from various locations. These travel bands are my zone data, I have a regular ...
