3
votes
0answers
82 views

ISOdata classifier in QGIS?

Is there a function that produces an ISODATA unsupervised classification in QGIS? The only unsupervised classification function I can find is a KMeans.
3
votes
0answers
42 views

How to add additional HTTP response headers?

I installed recent MapProxy (1.7.1) on Ubuntu 14.04 LTS following this guide. Everything works - I can get test OSM layer's tiles through proxy. But in order to use this layer on my web page I have to ...
3
votes
0answers
53 views

Temporary File GDB-based scratch workspace is not deleted after it is released

I have created a temporary File GDB-based scratch workspace as follows: var factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBScratchWorkspaceFactory"); var factory = ...
3
votes
0answers
51 views

How to calculate 90% confidence interval in a raster stack

I have a stack of grid files (23) in ASC format from a MODIS sensor and I need to calculate a 90% confidence interval, mean, min, etc, for each one in R, how can I do that? specially the interval. ...
3
votes
0answers
50 views

Connecting QGIS 2.x to Firebird Database via ODBC?

I tried to connect a Firebird Database in QGIS 2.2 and 2.4 via ODBC to a database and get following error message: Unable to initialize ODBC connection to DSN for SYSDBA/masterkey@Akdees ...
3
votes
0answers
77 views

Performing buffering and intersection with script in PyQGIS

I wrote a script that performs the intersection of two layers: The first Layer -> layer1, represents the rivers The second Layer -> layer2, represents a set of circular dots distributed in a ...
3
votes
0answers
47 views

OpenLayers.Renderer.Symbols custom named by function

Is there any approach to define custom OpenLayers.Renderer.symbol by a function? For example, instead of making a symbol for each 3-pointed, 4-pointed, 5-pointed etc. star ...
3
votes
0answers
24 views

Processing for large scale networking animation?

I am looking to create an animation of network connections, something very similar to this: http://vimeo.com/16897839. Let's say I have a huge database (millions of rows), that includes source ...
3
votes
0answers
585 views

QGIS 2.4.0 Mac Yosemite compatibility

I just upgraded to the Beta 2 version of MacOS 10.10 ("Yosemite"). I'm getting an error when I try to "drag and drop" shape files into QGIS. I'm running QGIS 2.4.0, GDAL 1.11, and MATPLOTLIB 1.3.1. ...
3
votes
0answers
95 views

How to calculate percentages using QGIS field calculator expression?

I am new to QGIS. I am wanting to calculate a field using other fields and some operators. Here is my expression: case When "RVM_CAT" = 'B' OR "RVM_CAT" = 'C' Then ("PC1" /100) * "RE_ha" When ...
3
votes
0answers
35 views

How to update a field in one geodatabase table via a join to another geodatabase table?

I have 2 tables in a file geodatabase and I need to update a field (via ArcObjects) in the first table with a field in the first. Basically, the equivalent to SQL Server's update statement: UPDATE t1 ...
3
votes
0answers
53 views

How do I check what type of mapsurround is on the map?

I want to have the program add a scalebar to the map, but only if there isn't one already on the map. The code below works for legends, but when I try to replace ILegend with IScalebar it doesn't ...
3
votes
0answers
91 views

An unhandled exception of type System.AccessViolationException

I am trying to upgrade a desktop extension from ArcGIS 10.0 to ArcGIS 10.2. I am getting this error: An unhandled exception of type 'System.AccessViolationException' occurred in GIS.Metadata.dll. ...
3
votes
0answers
46 views

ArcPy: Initialize zero valued grid Raster and iteratively increment

I'm jumping right into ArcPy to help out a friend who needs to automate some ArcGIS work. The problem at hand can be reduced to the following pseudocode: accumulationRaster = SomeZeroedRaster for ...
3
votes
0answers
154 views

Startup python script to re-join layers

In QGIS 2.2, there is a bug which involves using the JOINS properties on a vector layer (that is already being joined with several other vector layers) whereby the attributes are not fully loaded. ...
3
votes
0answers
56 views

Which edition of ArcGIS for Server and which capacity level?

I need to define the edition of ArcGIS for Server product to invest for a small scale oil & gas company. What we need is to be able to: Work on a geodatabase with 2-3 concurrent desktop users ...
3
votes
0answers
88 views

Creating one DEM from multiple ASC files

I am struggling with this several days and now its time to ask how to do it in QGIS. I have very detailed 27 ASC grid files with overall size of 9 GB created from 1m contours of large area (600 m2). ...
3
votes
0answers
62 views

How to calculate wait time on a one-lane road with two-way travel?

I want to know how to calculate the wait time on a single-track/one-lane road (only room for one car at a time) for one car waiting for another car to pass by. For example, two cars drive on the ...
3
votes
0answers
62 views

Can you use wildcards for column headers in Field Calculator?

I know you can use wildcards for fields like so (in the Field Calculator): case when "column" ILIKE '%example%' then 1 else 0 end Can you do something similar for the column headers themselves? I ...
3
votes
0answers
38 views

Option for 360 degree movie embedded in Open Source GIS software?

Is there any Open Source GIS software available to embed 360 degree movies with the map? For a COTS example, there is the Active Link Vision (ALV) extension for ArcGIS from IWANE.
3
votes
0answers
47 views

Raster loaded in ArcMap 10.2.1 not showing decimal places for value

I have an IMG format raster that I am loading into ArcMap 10.2.1. The pixel type and depth, as reported by the Source tab in Layer Properties is 32-bit floating point. The values, as reported in the ...
3
votes
0answers
64 views

IS it possible to run GRASS commands in the QGIS graphical modeler?

I have a geoalgorithm set up in the graphical modeler and everything runs except for the GRASS commands. It is really frustrating because when I execute these commands on their own they work just fine ...
3
votes
0answers
135 views

QGIS API - Print Composer Template produces empty map?

I have a print composer template which I'm trying to populate with different subset queries from a CSV-derived vector layer using the Python API. However, all the output PDFs contain everything except ...
3
votes
0answers
48 views

ArcMap add-in (vb.net) datagridview will crash map when right click on the title part

I find the problem accidentally. In my ArcMap add-in, there is a search function which allows the user to search the geodb based on the value of a field. It works fine but today when I right click the ...
3
votes
0answers
39 views

What projection system is used in China which is aligned with WGS84

I have some GPS tracks in Beijing. I want to project it and convert the lat long degree values in meters for calculation in euclidian space. I was wondering what is the most suitable coordinate and ...
3
votes
0answers
14 views

List Joined tables

I've a question about arcpy List* modules. I have a quite large amount of data on SDE Server. Earlier I made a list of the feature classes , and tables in the mxd-s placed there using da.Walk and ...
3
votes
0answers
36 views

NASA WorldWind : PointPlacemark label is not hidden by the terrain

I am facing this problem where the label for the pointplacemark using the NASA worldwind API is not hidden behind terrain. The symbol hides but the label doesn't. It uses javax.media.opengl.GL and ...
3
votes
0answers
83 views

How to export data from sql server into shapefile in the decimal format in QGIS 2.4?

The last couple of days, I have been working on exporting data from SQL to a shapefile in QGIS 2.4. While converting into a shapefile, the data type changes automatically from Float to Integer in the ...
3
votes
0answers
52 views

how are range domains validated when editing a feature service in ArcGIS Online?

I have a feature class and a range domain is applied to a field. I know we can use the "Validate Features" command for validation. My question is that when the feature class is published to ArcGIS ...
3
votes
0answers
63 views

Multispectral image segmentation for natural-resources applications using R

R has the capacity for image segmentation, although all of the examples I have come across utilize a single band for the segmentation (example). I am interested in combining R's capacity for random ...
3
votes
0answers
39 views

Looking for a QGIS solution to make aerial imagery ArcSDE compatiable

Would like to avoid having to use 3d Analyst and use free raster tools in QGIS or elsewhere to make aerial rasters ArcSDE compatible. This 18 page work flow is what I am trying to use. Any suggestions ...
3
votes
0answers
29 views

Algorithm for estimating position of many objects and differentiating those?

Let's assume a crowd-sourced tree location use case where a research team asks hikers to GPS the location of a specific tree type in case they encounter it. This will lead to a large number of ...
3
votes
0answers
41 views

Spatial interpolation with breaklines in R

I have a dataset consisting of irregularly-spaced points (x,y,value) that represent an area of ocean that contains some land. I need to interpolate these to a regular grid, ensuring that the ...
3
votes
0answers
43 views

Layer tick boxes embedded in PDF map

Maybe this is more of a PDF question than a GIS question. Today, I received a layered PDF map shown as a landscape A3, with a square map on the left, and with the map title, the legend, the scale, a ...
3
votes
0answers
55 views

Validity of ordinary kriging of polygon centroids

I'm in a discussion with a colleague who believes that kriging should not be used to interpolate a surface from polygon based data (i.e. with kriging applied to centroids), because this effectively ...
3
votes
0answers
187 views

Why does multi-threaded rendering not use all the CPU potential in QGIS 2.4?

I have just downloaded QGIS 2.4 which is great and ran some tests. I have enabled the multi-threaded rendering but it seems that the program do not use all the potential of my CPU. Attached pic shows ...
3
votes
0answers
63 views

Thermal Map Data

I am curious about making a thermal map to display where the hot spots and where the cool spots in a community are. Obviously the roads will be hot and the shaded areas with trees will be cool but ...
3
votes
0answers
68 views

How to find the minimum number of inspection points?

I am working on a pipeline inspection project and there is a high liklihood that some inspection tool deployment/retrival station will need to be installed on the pipe network. the problem is ...
3
votes
0answers
218 views

arcgis server performance comparison

Are there any recent comparisons/studies of arcgis server vs. open source gis servers in common tasks like providing a wms/wfs, filtering data/search performance, and so on? We received a lot of ...
3
votes
0answers
73 views

Adding Edit button to ArcGIS Javascript template?

We've been able to successfully download the Find, Edit, Filter template, customize the configurations, and host it on our own server but here is the issue we are facing now. We're looking to use ...
3
votes
0answers
72 views

Is there a “Disperse Markers” tool for QGIS?

I am using ArcGIS, but either I would like to use QGIS and maybe want to switch completely later. A have a point overlapping problem, as a result of geocoding of addresses. I have not found any ...
3
votes
0answers
152 views

ArcGIS FeatureService/Dynamic Map Service using SQL joins and aggregations

I have a bunch of operational tables, some contain spatial data, some do not. In order to fulfill all my operational mapping reports, I will need to have the flexibility to have feature services or ...
3
votes
0answers
40 views

Opposite than normal behavior in zoom with restricted extent and vector base layer

My map has OSM base layer and i have restricted its extent. This worked normally. Recently i added a blank baselayer so that the only overlays could be shown. base = new OpenLayers.Layer("Blank", { ...
3
votes
0answers
67 views

Arcpy in Python Plugin for SPSS

Is it possible to run the arcpy module in the Python for SPSS plugin to run the search and update cursors?
3
votes
0answers
131 views

ArcGIS Server 10.1 Integrated Windows Authentication with Token based

In ArcGIS Server 10.1 on Windows 7 and IIS, if wanting to secure services within an Intranet with Active Directory is that Integrated Windows Authentication ...
3
votes
0answers
70 views

How to create cost surface for least cost water transport analysis?

I am working on a project to derive least cost pathways between sites by dug out canoe travel. Has anyone worked on a similar project or found a function like the Tobler hiking function that can be ...
3
votes
0answers
644 views

How to display ONLY local country names in google maps?

I am using google maps in an application where it is important that country labels display the country name in the local language. If you pass in certain language parameters that google maps ...
3
votes
0answers
82 views

Basic arcpy script with cursors running SLOW!

I've got 2 polygons layers (no gaps): IDUs and crops. What I want is to identify the 3 largest crops by % area for each IDU. This seems common enough but I couldn't find a way to do it all using ...
3
votes
0answers
66 views

Servers that implement OGC Geo/Time OpenSearch

The OGC is close to publishing the "OpenSearch Geo and Time Extensions", which can be downloaded from http://www.opengeospatial.org/standards/requests/116. That specification is based on, but extends, ...
3
votes
0answers
173 views

Are there trade offs between using a geohash vs using a quadkey as a spatial index?

QuadKey Bing Maps uses a quadkey structure for their tiling scheme. Here is an overview of the concept http://msdn.microsoft.com/en-us/library/bb259689.aspx. GeoHash A geohash seems to be the more ...

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