All Questions

0
votes
0answers
10 views

“Phantom” features showing up in QGIS 2.4

I tried searching for this, but am unsure exactly what my problem is. I am using QGIS 2.4 on Windows 8.1. I have a project in which I have been digitizing from OpenMaps. Last night I was doing some ...
1
vote
2answers
34 views

Where can I find hydroelectric generation data for the U.S.?

It is my understanding that the US Army Corps of Engineers has some hydro generation data on their various websites (divisions, districts). For example, there is real-time hydro-electric data ...
0
votes
1answer
451 views

Packaging succeeded but publishing failed. ArcGIS 10.1

I am trying to publish a map on server but I am getting this error: **Packaging succeeded but publishing failed.** It was all working fine before. I haven't change the IP address of the GIS server ...
0
votes
1answer
30 views

Project from Datum Nad27 to WGS84

This should be simple: have a shapefile in UTM z16 DatumNad27 and want to transform it to Datum WGS84 latlon I am using Qgis 2.6 Sorry I am going to clarify, with the steps taken: 1- XY data of a ...
0
votes
2answers
10 views

How can I avoid incomplete wms layers when exporting large maps in qgis 2.6?

I have a QGIS 2.6 project with around 20 vector layers and on wms layer (working on Ubuntu 14.04). WMS rendering works OK, altough a little bit slow, and exporting A4-size maps also works properly ...
0
votes
1answer
13 views

How to avoid the ESRI basemap (Bing imagery) to update?

In my ongoing research, I intend to map transformations. That implies that, based on the ESRI basemap from Bing imagery, I draw certain features (in different layers) as they are today and as they are ...
1
vote
1answer
11 views

Add custom variables to leaflet polyline

I'm drawing a route on a map with leaflet. I'd like to click on any point in the line and display the speed and time at that point in a popup ($speed[$i]). latlngs = [<?php for ...
1
vote
1answer
87 views

How to export a set of layers into multiple PDF(orAI)files, one layer at a time?

I am completely NEW to PYTHON(only took a 3-hr entry course in ESRI tutorial. I have a dataset contains files named as "1_A, 1_B, 1_C....12_A,12_B, 12_c,....200_A, 200_B, 200_C..etc." I need to export ...
1
vote
0answers
10 views

How to calculate average wind speed at a particular location (given longitude and latitude)?

I am using ArcGIS 10.2 and new to this software. My question iss I have time series wind speed data in netCDF form. I extract netCDF in raster form after that in table form. Now I need How to ...
0
votes
0answers
9 views

Where do I get the coordinates of (african) borders from? [duplicate]

I want to draw a map of africa. Therefore I tried to find the coordinates of the coast and the borders as latitude/longitude. Where can I download this data for free, preferably in Excel format?
1
vote
0answers
12 views

How to create network dataset for train lines with points representing train stations in ArcGIS 10.2?

I would like to build a network dataset that that includes a line shapefile representing train lines and a point shapefile indicating train stations along those lines. When I right-click on the ...
0
votes
0answers
5 views

Arcmap not changing to landscape view?

Arcmap refuses to change my layout view to landscape when I change the options in Page and Print setup. It keeps the exact same portrait box as before.
2
votes
1answer
27 views

ArcMap many-to-many join

I'm working in ArcMap 10 and can move around in R, though am not an expert. I have a shp file and an xlsx file. The shp file is 20,221 rows and includes a field GID (grid ID) which is not unique ...
1
vote
0answers
24 views

Creating multiple routes at same time with different stop locations using ArcGIS Network Analyst?

I have a feature class that contains about 500 cross-streets locations and another feature class that contains about 1800 locations. I need to create a route from each cross-street to 1-6 locations. ...
1
vote
0answers
12 views

GEOS_ERROR: TopologyException: Input geom 1 is invalid: Self-intersection at or near point

I'm using GeoDjango (but I guess this is from the geos library). I have a set of polygons that compose a city surface and I want to merge them into a single one. The code looks like this: polygons = ...
0
votes
1answer
209 views

Orthographic reprojection with mapnik

I am trying to create a google earth like wep application. My problem is that I can't get to render a full view of the earth. The zoom_all() function generates the following error : RuntimeError: ...
2
votes
1answer
35 views

How to export projected layers with relative cartesian (x,y) coordinates in ArcGIS

I've got several GIS datasets for a national park in South Africa (elevation map, water points, elephant density and such). I have access to the full ArcGIS Desktop Advanced suite, but am no GIS ...
0
votes
1answer
22 views

Snapping one vector layer to another

Is there anyway to snap one set of vectors to its nearest neighbor vector in another feature class? For example, I have a road feature class and a feature class of bridges and I want to snap the ...
0
votes
1answer
9 views

QGIS Print composer, problem with angled grid lines that loks like recentagles insted of squares?

I just tried to create an extremely simple map made of one layer loaded as WMS layer for Croatian's geoportal (http://geoportal.dgu.hr/wms) I successfully loaded necessary layer and created everything ...
0
votes
0answers
9 views

Merging different layers with same classes, but attributes overlap

I want to merge several layers (vector polygons) that all contain a field about land use. I would like to give weights on combining these layers in order to get one "land use" per polygon, but I ...
0
votes
0answers
4 views

cannot figure out choloropleth map with kartograph.js

I am trying to make a very simple choropleth map uisng kartograph. i am able to create simple svg world map but i cannot figure out how to create a choropleth map with kartograph.js. The map falls ...
1
vote
1answer
109 views

Creating a postgis database a GML application schema

Is there any open Source tool(automated or semi-automated) that converts GML application schema to a POSTGIS database/table .Specifically I have a huge application schema containing many ...
0
votes
0answers
7 views

gdalwarp with NETCDF files

I have been looking for it for a while but couldn't find what exactly I need. I have WRF outputs in NETCDF format and I want to convert them to Geotiffs with gdalwarp. I think my -s_srs should be ...
2
votes
1answer
24 views

How can I transfer waypoints and tracks from Base Camp into QGIS2.6?

I'm working on transferring all my field data from Garmin Base Camp onto QGIS. This is an attempt to overcome the learning curve from basic trail GPS mapping programs to the real thing. I'd like to ...
0
votes
1answer
126 views

How to zoom to layer using ArcGIS Javascript API

I tried to get the function "Zoom to Layer" done using the following code snippet. But it does not change anything. The layer is a feature service layer, and I can see the full extent object of the ...
1
vote
1answer
11 views

QGIS graticule coordinates in print composer starting from 0?

I am not sure how to explain the problem correctly as my English isn't as great as it should be - but let me try anyway. I just tried to create an extremely simple map made of one layer loaded as ...
2
votes
1answer
511 views

How to dynamically measure and display radius of circle in OpenLayers?

I want to give my user the ability to click on the map and give him a dynamic circle drawing tool which also reads out the radius measurement. That way the user can see how big the circle he creates ...
1
vote
1answer
132 views

How to set the length of a line using openlayers

I'm trying edit a polygon by changing the length of some lines by code. Found this method to calculate based on the bearing. But I didn't find anything on how to calculate the bearing, before I start ...
0
votes
0answers
5 views

pgrouting with wms

I able to successfully perform pgrouting using wms but I am looking to show the cost (the length) on the webpage (not only the line on the map but the length of the line) some where in a div next to ...
3
votes
2answers
46 views

How to fill sinks in DEM with specific amount of water

I identified the sinks in my terrain based on the DEM (grid) by using the 'fill'-tool and substracting the original DEM from the filled DEM. I also identified watersheds as well as flow paths. Now i ...
2
votes
2answers
41 views

Selecting percentage of points from multipoint layer (ArcGis)

I am currently working with las dataset of small area, and I want to run some quick analysis on this area. Since my PC is not the best, I am looking for tool like "extract 50% of multipoints to new ...
1
vote
1answer
167 views

How to clip a raster by a shapefile in pyqgis?

Currently I am working with some satellite images (grib files) in pyqgis. As I want to work only with the cells in my study area, I need to clip the raster by a shapefile. I know I can do this by ...
11
votes
9answers
7k views

Python GDAL package missing header file when installing via pip

I asked this question on Stack Overflow before I realised this site existed. As this site it more appropriate, I'll ask it here too. I'm trying to install gdal from pip pip install gdal inside a ...
7
votes
4answers
5k views

Using android phone to plot GPS points?

I was wondering if I could use my android phone (HTC Wildfire) to plot gps points and export these into GIS software (I have QGIS and MapInfo). Thanks, Alan
18
votes
8answers
11k views

Where to get 2010 Census Block data?

This might be a stupid question but I would like to download 2010 Census Block Data for several towns and I can't seem to find it on American Factfinder. Is it there? And if not, does anyone know ...
2
votes
3answers
4k views

Income data on a block level: how does a newbie do it?

I am a complete newbie at GIS data, and am trying to do the following: Figure out census blocks in Miami-Dade (and several other counties) that have average household incomes > $75,000 Get the ...
0
votes
0answers
30 views
+50

Cell declustering using open-source software

I want to perform cell declustering in a small point data set. I have 9 observation points and I want to find the size of the region of influence for an observation, and afterwards use that as ...
1
vote
3answers
131 views

PostGIS importing shapefile error w/ official manager

I'm having some trouble when trying to import an shapefile of the Sao Paulo Brazil's state (I downloaded it from the web and I'm using the own PostGis manager to import it). Here's an image! The ...
0
votes
1answer
14 views

Why does clipping polygons result in no features?

I'm using QGIS 2.6. I'm trying to clip the polygons in one layer by another but cannot get the results I expect. I have a layer with wetland areas, and another layer with the boundary of my client's ...
1
vote
1answer
24 views

Index to speed up ST_HausdorffDistance?

When comparing similarity of linestrings with ST_HausdorffDistance (or another type of similarity function), is there a way to use an index to speed up the search for similar linestrings?
3
votes
2answers
1k views

How to trigger a hover event for map graphics in ArcGIS Javascript API?

I want to trigger an event when the user hovers over a geometry that they drew. I know how to set up hover events for DOM objects, but not for graphic elements within the map window.
0
votes
1answer
224 views

Free ServerContext has failed because the Wait Timeout Interval has elapsed

All, ESRI ArcGIS Server 10 SP4 logs below entry in log file. We have a single map service with 100+ layers which has Maximum time client can use a service is 600 seconds (10 min). I am really ...
2
votes
1answer
35 views

Join only if one line line intersects buffer. Do not if two

I've got a road network (line features) and a trip of GPS-Points. I want to join attributes from the road network to every point. So for each point i create a buffer. If the buffer intersects with a ...
0
votes
0answers
23 views

How to define the next object in the street with android?

I wanna put objects in a map and discover which is the closest objet from me, supposing that I'm in a moving car with my cell phone. Thus, to define the closest object I need to take the orientation ...
3
votes
1answer
224 views

shortest distance between a raster and another raster

i am using arcgis 10.1 i want to calculate the shortest distance between a raster and another raster. i have a bathymetric raster and an underlying fault plane raster. for each bathy raster cell, i ...
5
votes
2answers
299 views

QGIS 2.4.0 How to display only selected features on map?

Not sure if this option ever existed, but the new QGIS version hides a lot of things somewhere else and this seems so simple that I'm kind of convinced it was possible to do this before. I have quite ...
3
votes
1answer
454 views

Large loads geojson from mysql to leaflet?

I have a mysql database with +25K rows including geometry and other attributes. Using a mysql2geojson php script I then added it to a leaflet map. It is super slow now, what can I do to boost the ...
0
votes
0answers
4 views

Geonode upload netcdf and hdf and custom queries [on hold]

What is the best way to make geonode upload those files and how extend it with custom maps queries
0
votes
2answers
11 views

Remove All Features from Vector Layer in OpenLayers 3

Looking at the OpenLayers 3 ol.source.Vector docs, I can see that there exists a method ol.Vector.removeFeature(feature). Does this mean the best way to remove all the features from a vector layer ...
0
votes
1answer
183 views

How to Represent large data using google map api in javascript

1) I am trying to represent data using bins as the data was too large to display each and every point simultaneously. but the problem with this also existing if the no of bins are getting larger ...

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