Questions tagged [geoprocessing]

Geoprocessing is a GIS operation used to manipulate GIS data. If you are performing geoprocessing using ArcGIS then the tag Geoprocessing-framework is specific to that software and should be used instead.

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4
votes
6answers
7k views

Creating polygon feature class from area in one not covered by another using ArcGIS Desktop?

I am working on a project doing spatial analysis at a statewide level. I am looking at a form of transportation coverage in a state, and part of my analysis involves buffers and drive time polygons. I ...
25
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10answers
6k views

Existing solutions to automate generalisation/simplification of geographical data?

I am looking for existing solutions (softwares, libraries, methods, etc.) to automate the generalisation/simplification of geographical data as presented there, and also there. Do you know and use ...
9
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0answers
7k views

Splitting feature class by unique values for an attribute/field in ArcGIS for Desktop? [duplicate]

I would like to split a single shapefile into multiple shapefiles by using unique values for one attribute/field to select features for each value out into a new feature class. I found ET Geowizard ...
4
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2answers
10k views

Intersect Shapefiles using Shapely

What I'd like to try and do is intersect some point buffers with census tracts, maintain their ID's and the tracts attributes. I found a sample from http://www.macwright.org/2012/10/31/gis-with-...
16
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4answers
25k views

Automated/geoprocesing tool to slice, clip, or cut polygons using polylines using ArcGIS Desktop? [duplicate]

Looking for a simpler method here. I am trying to split up / cut / slice existing polygons by using existing poly-lines. An example would be splitting a water body or land parcel at the point where a ...
14
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2answers
4k views

Avoiding fails from ArcObjects geoprocessing with .NET?

There are some nice features in ArcToolbox we can use, but for some reason, this is NOT working properly. It doesn't even throw me an error. My software is running inside ArcMap, so no need to ...
3
votes
3answers
11k views

Why do ArcToolbox tools give ActiveX error?

I work with ArcGIS 9.3. When I try to run any ArcToolbox tool I receive the message: Window Internet Explorer [Title of the Window] One or more ActiveX controls could not be displayed because ...
33
votes
4answers
37k views

Python Script examples for geoprocessing shapefiles without using arcpy

I would like to use a Python script that is not based on arcpy to do things like query a shapefile by attributes, create new layer from selection, and calculate areas of a polygon and convert ...
40
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8answers
15k views

Select features that do NOT intersect in PostGIS

This seems to me like such a simple question (and it probably is) yet I cannot seem to find an example that gives me the answer. Using PostGIS, I just want to select points that fall outside of ...
11
votes
2answers
9k views

Finding differences between shapefiles using ArcGIS for Desktop?

Every month I have to QA/QC some streets data for an entire county (over 47,000 records). The first step is to compare the two files. Currently, I'm using a tool that was created in house via VBA ...
8
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10answers
4k views

Device for Logging GPS and Accelerometer Data? [closed]

I am looking for a device that can track my location (lat,long) and speed all day long. Perhaps, I need GPS and accelerometer data bundled together. What I want to do is to log my daily activities. I ...
33
votes
10answers
6k views

How to easily shift all features in a vector dataset?

Let's say that I put together a Shapefile and all the features have their vertices shifted by a constant amount. What's the easiest way of shifting all the features (hence the (x,y) position of their ...
8
votes
3answers
3k views

How to create spider diagrams (hub lines) in PostGIS?

I'm rather new to PostGIS but I have done a lot of reading. One thing that I have been searching for is a function that allows users to create a "spider diagram" (also called "desire lines" or "hub ...
4
votes
1answer
4k views

Finding the common borders between polygons in the same shapefile

The question is essentially the same as here, except that I want to do it in qgis. Thus, is there a qgis function equivalent to the ArcMap intersect function that will take a polygon layer and output ...
11
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4answers
12k views

What ArcGIS geoprocessing tools support exporting tabular data to CSV?

I have found that most if not all geoprocessing tools that allow tabular output are limited to geodatabase tables and DBF files for supported output formats. Are there any that also support CSV output?...
7
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2answers
1k views

Reordering polygon shapefile permanently?

I've written a script which produces a polygon shapefile of the extents of all the thousands of rasters in our library. I want to organise the FID so that the files with the largest extents are on the ...
10
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1answer
6k views

Explode MULTILINESTRING into individual segments in PostGIS 1.5

I have a MULTILINESTRING in PostGIS consisting of several LINESTRING's. Consider each LINESTRING to have a set of POINT's P1, P2, ... PN forming the line segments L1, L2, ... LN-1 where LX is ...
6
votes
1answer
2k views

How to calculate te area between contour lines on a DEM with QGIS 1.8?

Does anyone know how to calculate the area in km² for each altitudinal band (between 100 and 200, 200 and 300...) based on a DEM? I added the contour lines with a distance of 100 metres but could not ...
5
votes
3answers
504 views

Clustering neighboring points inside ArcGIS Desktop?

I am using ArcGIS Desktop 10x. I have a shapefile of 300 points which I need to make groups, each of which will contain exactly 9 points which are closest neighbors. I tried the 'near' tool, ...
17
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3answers
4k views

Is there a way to automate the preprocessing of LANDSAT data?

I'm currently enrolled in a remotesensing course, using LANDSAT data. Part of my course is about standardizing the scenes based on radiance values. I assume that because this is such a tedious task, ...
11
votes
5answers
25k views

Creating polygons around extent of similar points using ArcGIS Desktop?

I've millions of points collected for lithology layer. They have used a coding for different types of rocks. I need to create a polygon around the extent of similar points. What is the easiest ...
3
votes
1answer
722 views

nx_spatial does not read all shapefile features

I have a polyline shapefile for a road network. The roads are split at every intersection (node), e.g. if two roads intersect at one point, then they are split into four links(edges). So using the ...
9
votes
1answer
4k views

Grouping map points into fixed cluster sizes?

I have a dataset of 655 lat/long pairs which I'd like to split into about 100 groups. A group should have 5-10 pairs which are geographically close to each other. Dense groups should have more ...
12
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4answers
9k views

Finding Clusters of N Points Within X Distance using ArcGIS Desktop?

We have tried two methods of cluster analysis: Cluster and Outlier Hot Spot ... but neither meets our specification which has these 3 parameters: a Set of Point features N points within a Cluster X ...
8
votes
3answers
1k views

Improving ArcGIS Results saving and manipulating

The ArcGIS Results Window is an incredibly useful way to keep track of what has been done in a particular map. I use it constantly as a means of documenting the essential parts of a project's workflow,...
7
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1answer
3k views

Inside buffer with attributes in ArcGIS?

How can I create buffers for polygons that: a) lie only inside the polygon boundary, and b) know who their parent is? An example of where this is useful is First Nation Traditional Territories. ...
6
votes
2answers
844 views

Is there a RESTful way to cancel a GP Job?

I have an asynchronous gp service that I can successfully run and cancel from within Arcmap. Using fiddler I see that arcmap communicates with the GP service via SOAP. I'd like to cancel the job ...
4
votes
2answers
9k views

How to Select “Inverse” of intersection of two polygon layers?

I'm wondering if there's a way to intersect two polygon layers, take the intersection, and remove that from one of the polygon layers, making a new layer out of whatever is left over? Basically, the ...
3
votes
3answers
2k views

Remove islands and completely surrounded polygons after polygonization with QGIS

I have a line map of buildings in a city. I was able to correctly polygonize the buildings in QGIS with the Polygonize processing algorithm. All the holes/islands became features as expected. Now I ...
2
votes
1answer
3k views

GRASS Geoprocessing in Python Script

I´m trying to get some GRASS geoprocessig tools running in a python script outside GRASS. I´m able to import grass.script, but I´m not able to get the tools running yet. Does anybody know what I´m ...
7
votes
3answers
8k views

Topology or out of memory errors with large dataset intersects and spatial joins in ArcGIS

I receive a topology error notification when intersecting a point dataset (with ~5 million points), with a polygon dataset created by buffering those points by a half mile. The goal is to create a ...
6
votes
5answers
28k views

For every point, distance to nearest polygon of type X?

In ArcGIS Desktop, can you calculate as an attribute value the distance to the nearest polygon of type X? Assume we have a point layer of wildlife observations and we want to know how far each of ...
4
votes
1answer
203 views

Adding and calculating X and Y attributes in integer raster using ArcGIS Spatial Analyst?

I have an integer raster created from an input floating point (LiDAR) raster by multiplying it by the (elevation) value of 100 (any other value higher would not work) Thus, I can add a "double" ...
3
votes
2answers
7k views

Using Value from Iterate Feature Selection to Calculate Field in ArcMap 10.1 ModelBuilder

I have two polygon feature classes, an alignment layer and a parcels layer. I am trying to use ModelBuilder to create a tool that will do the follow: iterate through groups in a single field of a ...
69
votes
11answers
11k views

Alternatives to using Arcpy

I seem to use ESRI's Arcpy site package for virtually all of my python geoprocessing. To ESRI's credit, these are an incredible suite of tools that can help accomplish a great deal. However, I would ...
34
votes
2answers
2k views

Streamlining Python Code for Big Data

I have Python code which is designed to take point shapefiles through the following workflow: Merge points Integrate points, such that any points within 1 m of each other become one point Create ...
22
votes
6answers
17k views

What LiDAR processing tools are available in Python?

I have been using FUSION and the command line FUSION Lidar Toolkit (LTK) to process LiDAR data. A broad Google search ("Lidar Python") yielded libLAS and pyLAS as Python LiDAR libraries, however, ...
18
votes
3answers
1k views

Using GIS tools for non-geographical problems

Many other fields have visual/"spatial" problems that can potentially be solved with GIS tools. I know I've used GIS tools for the odd non-geographical task and was wondering how much this happens and ...
7
votes
4answers
8k views

Split Lines at Intersection of Other Lines

I have two line layers (roads and contours in this example) and I would like to split the roads layer every time it crosses/intersects a feature on the contour layer. I can't seem to find a tool that ...
9
votes
3answers
9k views

Why is it important to use feature layers in ModelBuilder?

I am trying to understand creation of a geoprocess with ModelBuilder, but I don't know why it's important to use feature layers instead of feature classes when creating a geoprocess with ModelBuilder. ...
6
votes
1answer
521 views

Splitting overlap between polygons and assign to nearest polygon using PostGIS?

My question is quite related to the unanswered Split overlap between polygons into disjoint sets except I'm not using shapely, I'm using PostGIS 2.4 on PostgreSQL 10. I have a table containing ...
6
votes
1answer
3k views

Merging and joining two line feature classes while maintaining attributes from both using ArcGIS for Desktop?

I created an event layer using the MAKE ROUTE EVENT LAYER tool based on anticipated scheduled events. The road layer which is the base layer is intact. What I would like to achieve is combine layer ...
10
votes
2answers
4k views

Is there a Free Aggregate Points tool out there for ArcGIS 10?

I need to do some Getis-Ord analysis but first I need to aggregate my points. I know of XToolsPro, but the aggregate points function is locked and you must purchase a license to use it. I am ...
5
votes
3answers
8k views

How to create Point Transects along line?

I would like to create a point shapefile that will contain sampling points along, and perpendicular to either side of a track route that I have as a line feature in ArcGIS 10.1. The points on the ...
10
votes
3answers
7k views

Enabling multithreaded processing in QGIS?

I have found multiple links that appear to say that this now exists in QGIS 2.2, but it appears that it's only using one core to full capacity. This is running on Ubuntu 14.04 The current process is ...
7
votes
4answers
2k views

How to aggregate detached polygons?

Is there any open-source library to aggregate detached polygons? I know that there is a tool in ArcInfo, but it is commercial.
4
votes
1answer
963 views

Raster Calculator dynamic map algebra expression

Is it possible to dynamically construct a Map Algebra expression that is dependent on the output of another tool, either using model builder or arcpy? For example, say I have a model that performs a ...
9
votes
6answers
2k views

seeking “Available Sky” implementations

I'm looking for implementations of an algorithm called "Available Sky". ArcGIS (Spatial Analyst or GRID) is preferred, but solutions in GDAL, SAGA GIS or others are perfectly acceptable. The ...
5
votes
1answer
1k views

Dissolve only overlapping polygons in R

I have a spatialpolygons-dataframe in R that contains overlapping polygon features. I would like to dissolve only the overlapping features into separate polygon features (one feature per par of ...
5
votes
3answers
2k views

Split and count overlapping features within a layer

I would like to split a shapefile in qgis according to how the polygons overlaps. See pic for explanation: