0
votes
0answers
4 views

GRASS init error in QGIS?

Every time when I start my QGIS I see the following message: GRASS init error: Problem in GRASS initialization, GRASS provider and plugin will not work : Module built against version $Revision: ...
4
votes
2answers
267 views
+100

How to use interacting PostgreSQL/PostGIS triggers in QGIS to create multiple labels on polygons?

EDIT: The trigger functions posted are well done but there are still a few issues. I've uploaded two screen recordings: http://workupload.com/file/ygRnYtp9 http://workupload.com/file/OBY7i9Fh I ...
1
vote
1answer
10 views

How to install xlw and xlrd libraries on MacOS so that QGIS Python can see them?

I experience a problem with XYtools and need to install Excel libraries for Python. I tried to install them directly from the terminal and it worked on the system, however, how to import them into ...
0
votes
0answers
4 views

Split 3D Spheres with 3D Walls (lines converted to 3D)

I would like to split spheres (created from 3D buffers) in half using 3D fences/walls (lines converted to 3D). Both datasets are multipatches.
0
votes
1answer
6 views

Method to determine a person's city/state using location co-ordiantes?

I am working on data-mining project where I have to map a bunch of tweets to US states. I can get the lat/long co-ordinates from the tweet json, but I am not sure if it is possible to map those ...
0
votes
0answers
4 views

Need WFS-T for field work on GeoServer/PostGIS

I'm using a Boundless install of OpenGeo Suite on Ubuntu Server 12.04 with Tomcat 7. I found this tutorial ...
2
votes
2answers
214 views

Error in displaying wfs layer from mapserver/postgis

I have read and tested all the relative posts but I still don't have a solution for my problem. I have a layer suscribers (points) stored in postgis database with srid=32232. I would like to display ...
1
vote
2answers
21 views

How to select and change only certain (same)values in attributetable in QGIS

I have an attributetable. Spread all over it are numbers like -99999997. I want to replace them by zero (0). There a many columns in which there are such numbers. I have used the expression (an ...
0
votes
0answers
27 views

Which nodejs-postgis package do you recommend?

I need your recommendations. I want to use nodejs with postgis to extract point or polygon data from postgis db in geojson format and display it in ol3 or d3. Especially polygon data in my postgis db ...
3
votes
2answers
36 views

Unexpected behaviour using ST_Equals() with QGIS

Let's say there is a table 'polygon_a' and a table 'polygon_b'. Each table contains three polygon features. The polygon features are spatially equal. CREATE TABLE polygon_a ( gid serial NOT NULL, ...
0
votes
0answers
9 views

How to style Geofabrik shapefiles to resemble Open Street Map?

I have downloaded the shapefiles for the UK from http://www.geofabrik.de/data/download.html I have loaded the shapefiles in to QGIS. Could someone please explain to me or point me in the direction of ...
0
votes
0answers
9 views

Can QGIS plot coordinates in Degrees-Minutes format?

I have a .csv file of coordinates that looks like this: Is there a way for QGIS to plot coordinates formatted like this? I've tried Adding a Delimited Text Layer... in QGIS, but do not see any ...
2
votes
1answer
615 views

How to create Map Document for DotSpatial?

How can I create a Map Document (including layers, symbology info etc.) for DotSpatial just like we have MXD File in ESRI ARCGIS.
4
votes
2answers
3k views

Multiple labels in QGIS [duplicate]

Is it possible to show 2 or more labels for 1 layer? For example - 1 label will show the name of a school and the 2nd label will show the number of students? They should be completly different labels. ...
1
vote
1answer
2k views

problems starting publishing services with ArcGIS for Server 10.2

I have just installed ArcGIS for Server 10.2 on my server and the publishing services will not start. Has anyone had issues with this before? The error message that I receive after the service fails ...
0
votes
0answers
7 views

External SLD file for OpenLayers

I'm creating a application with Geoserver, openlayers and Postgis. At some point, the user can select his own style for a layer. I've succeded to make a php script to write to a file the SLD code. ...
0
votes
2answers
673 views

evt.layers undefined while trying to display Legend widget in Javascript API

I cannot get an ArcGIS Javascript API Legend widget to show up. An excerpt of my code is as follows. I believe I'm failing somewhere near the console.log that I call...undefined comes up in the ...
-3
votes
0answers
12 views

PPGIS application development, am i able to do this application using tools like M**b*x, using leaflet.js and mapbox.js.? [on hold]

My goal is to create PPGIS application where people can get information in an interactive webGIS app but also can create the "content". Web based application should have following functionalities ...
1
vote
1answer
20 views

How to point out a place in iframe using latitude and longitude

I want point out a place using latitude and longitude in following frame, <iframe width="75%" height="550" frameborder="0" scrolling="no" marginheight="0" ...
3
votes
1answer
27 views

QGIS convert long integers stored as string to integer

I have long integers (11 characters) stored as text in a shapefile that I need to convert to integers, but when I attempt to convert them in the QGIS field calculator, I get the following error: Eval ...
2
votes
1answer
15 views

Using findAndReplaceWorkspacePaths to change datasource for CAD files- ArcPy

I try to use "findAndReplaceWorkspacePaths" in order to change datasource for CAD files. This code works fine but when there no cad layers to work with, despite this the code will print ...
0
votes
0answers
6 views

Build network based on shortest distance between points

Is there a way to build a network based on the shortest distances between each point of a point layer. I have occurrence data from species (as points) and want to estimate whether there are one or ...
2
votes
0answers
9 views

Qgis feature count increases at save layer edits

QGIS (2.12.3, running on Windows) increases the feature count of a vector layer when I "save layer edits". If I do the following steps: create a Vector layer (shp file) enable "show feature count" ...
3
votes
1answer
430 views

Consuming ArcGIS Online map service using static IP address for VPN?

I'm currently using the URL http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer for my iPad map service. However, we need to connect to VPN to access the internal ...
1
vote
0answers
17 views

How to deal with QGIS Viewshed analysis MemoryError?

I have one SRTM Dem file and one point on it. I'm trying to use the Viewshed Analysis plugin for QGis to calculate the viewsheds from that point. Instead, I get this kind of error: Traceback (most ...
2
votes
0answers
63 views

vector map.png image do not display

im using ms4w on my localserver. this are some codes inside my mymap.map file. MAP etc..... OUTPUTFORMAT NAME pnggd ...
-1
votes
1answer
5 views

Problem loading specific WMS with leaflet

I try to add this WMS in a Leaflet map by using the L.tileLayer.wms. ...
3
votes
3answers
1k views

Matching Census Block Groups from different decades to show percent change?

I know for Census Tracts and Blocks there are relationship files, but what is the best way to match Census Block Groups from different decades to compare change?
3
votes
1answer
540 views

Perform Multiply (Times) function on several reclassified rasters using Python

I have several reclassified rasters (0 = snow cover, 1 = no snow) and I would like to use the multiply function on all rasters that have the same spatial extent. In ArcGIS 10 this function can be ...
3
votes
1answer
184 views

Export to raster tool changes the output values

I am working with interpolated temperature data. The image's maximum and minimum values are 11.9 and -1.7, respectively. I exported this image to raster using export to raster, but the max and min ...
0
votes
0answers
4 views

Import csv data to local nominatim/photon installation

I have some additional address data (.csv file) that I would like to import to my photon/nominatim installation. Is there some way to do this? I cannot upload the dataset to OSM because it is not open ...
0
votes
2answers
2k views

Cannot open shapefiles in ArcGIS Desktop 10.3

I have shapefiles and mxds that were working fine in 10.1. I then downloaded version 10.3 ArcGIS Desktop Advanced. Now when I open the mxd, all of the data links are broken. when I open properties ...
4
votes
1answer
57 views

Which is better for measuring actual ground elevation, NED or SRTM?

I know that NED DEM layers are created using mainly Lidar point clouds and that the SRTM derives its data from shuttle-based radar. I have both of these loaded into QGIS and can see that over my study ...
1
vote
1answer
366 views

ScaleLine shows NaN for LCC projection

I have used openlayers along with geoserver. My Map is having LCC projection by default, but SRS is EPSG:4042. The problem is that the scaleline shows NaN in meter as well as feet. How can I correct ...
1
vote
1answer
13 views

Using findAndReplaceWorkspacePaths to change picture path element- ArcPy

Picture element, in 60 MXD files, disappear and there only blanked rectangle instead. I know one way to solved it, by go to the picture properties-->picture tab. But i try to find a way do it with ...
2
votes
1answer
272 views

Turn bathymetry into elevation in arcGIS?

My raster is in depth of bathymetry however when this is shown in 3D it reverses the elevation making the deepest points the highest in elevation and the shallowest points the deepest. This makes a ...
2
votes
1answer
25 views

How to create lines to visualize differences between polygon features in PostGIS?

I've a PostGIS table 'polygon_b' with some polygon features. There is also a table 'polygon_a' which contains the same polygons as 'polygon_b' but with minor changes. Now I want to create lines to ...
0
votes
1answer
628 views

Read GeoJSON with openlayers

I generated a GeoJSON from a table in EPSG:WGS84 in postgis SELECT ST_AsGeoJSON(geom) FROM "onibus" I put this file into the www folder on my server. I'm running geoserver locally. My pages are ...
-1
votes
0answers
12 views

I want to build GIS based java application that runs on browse

I am developing one GIS application in java, for that I am using OpenMap and GeoTools libraries(alternatively). These libraries are giving me a frame or say a standalone application, but what I ...
1
vote
1answer
2k views

Google Earth export from QGIS

I'm using Quantum GIS. Is there a way to export a shapefile to Google Earth format (*.kmz) using QGIS? Thanks.
2
votes
0answers
23 views

Insert sequential row and column values automatically into a fishnet dataset

I have a grid that has about 30 rows with approx 15 columns each. I want to label them as A1,A2,B1,B2 etc (Alphabet row, integer is column). Is there any way to do this programatically? There is no ...
2
votes
1answer
24 views

Wrong shape display with North_Pole_Azimuthal_Equidistant projection

I need to create a map that displays the breeding and wintering ground of a bird species that has a circular arctic breeding distribution and winters in Africa. The map should lool pretty much like ...
1
vote
1answer
29 views

QGIS Pre-set CRS/projections missing/unavailable

I am using QGIS 2.0.1 running off of a Ubuntu computer. I have been going through some basic tutorials (http://fossgeo.org/free-qgis-courses/) and have come up against a small and silly little ...
1
vote
1answer
263 views

Using M 'Measure' value in SQL Server 2008

MS Sql Server 2008 geometry type supports adding Z and M values to geometry objects, including linestrings. However, I cannot find any way to make use of these values, since methods such as ...
1
vote
1answer
18 views

How to update a timestamp in SQL?

I've explored this forum fairly extensively trying to get answers as to why my SQL isn't working. I need help with the timestamp on a torque map. I've used the following formula, obviously changing ...
0
votes
1answer
14 views

Ora: 01036 illegal variable name/number in ArcObjects

I want to write a feature to a featureclass and use bellow code.On StopingEditing() return error "Ora: 01036 illegal variable name/number ". What am i missing? IWorkspace ws = ...
1
vote
1answer
302 views

Set definition expression from click event

I'm trying to set a definition expression according to a user-selected value from a drop down menu, but I can't get the map to update the feature layers according to the expression. The user is able ...
0
votes
0answers
8 views

Administrative Regions? [on hold]

Is there a way to "smart" design administrative regions within countries or i just have to design them through the polygon tool? Sorry for the question if it is obvious or too simple, but I'm new to ...
3
votes
1answer
21 views

Merge a list of spatial polygon objects in R

I have a list of spatial buffers (30000 buffers) that I built with the function lapply: buff.pts <- lapply(1:nrow(pts.prj), FUN=function(l){ buff <- gBuffer(pts.prj[l,], width=1000) ## 1km ...
7
votes
3answers
157 views
+50

Identify and delete overlaping or near lines with similar running

I have shapefiles with lines that shows surface water runoff. I need to clear and simplify these shapefiles by condition that if some lines are near by other and has similar running, this lines has to ...

15 30 50 per page