8
votes
1answer
216 views

Google Maps/Earth becoming GIS solutions yet? [closed]

I've been researching internet lately to make a comparaison between Google Geo solutions ( Google Maps, Google Earth) and other GIS solutions (Free of charge or commercial, QGIS, ArcGIS, etc.). I can ...
1
vote
1answer
519 views

How can I use the proj string in java code?

I want to do projection from UTM/oblique mercator CRS to WGS84. And I know the solution to use a proj.4 string in commandline like+proj=omerc +lat_0=51.4 +lonc=7 +alpha=-10 +k=1 +x_0=0 +y_0=0 +gamma=0 ...
1
vote
0answers
443 views

How to create a regular polygon grid in Openlayers?

I am trying to create a grid in my map and do some calculations. I seen the following links:- Create regular polygon grid using postgis Create regular polygon grid inside a polygon using postgis ...
-2
votes
2answers
277 views

How can I read binary PBF and bzipped XML OSM data in QGIS?

How can I read binary PBF OSM data, e.g. example.osm.pbf or bzipped XML OSM data in QGIS?
2
votes
1answer
442 views

plpgsql | before update trigger: insert the new pseudo-record in another record and leave the old one as it was

I've got the following table: CREATE TABLE alumbrado_puntos_luz ( id numeric(8,0), "GEOMETRY" geometry, revision_actual numeric(10,0), revision_expirada numeric(10,0), CONSTRAINT ...
1
vote
1answer
128 views

Rewrite query to match two points with a linestring in a different database table

OK, not sure if I've worded the title brilliantly, but here goes: Suppose I have: a table "gps_nodes" containing columns: "EASTING" (containing longitude data) "NORTHING" (containing latitude ...
12
votes
2answers
2k views

How do GPS/Glonass/Galileo satellite know their position?

We use satellites to calculate our position. How do satellites know their position if it is right or wrong ? I have heard that the base station records and corrects the satellite path but how do they ...
1
vote
0answers
86 views

Conflation integration in geoserver

I have a task at hand to provide conflation functionality in our software. We are using JTS for other WPS operations. Open source JCS library is available but we need it as a WPS service integrated ...
1
vote
1answer
4k views

Converting longitude and latitude coordinates to Indian Grid system?

How to convert lat/long coordinates to Indian Grid system? I've googled for a couple of days but didnt find the exact algorithm for this. and i got a link Indian Grid System. but i didnt get a ...
2
votes
1answer
736 views

Navigation/Routing in 3D View On Android

I need to build a navigation/routing application in 3D view like sygic, what are the available options if any? Are there any existing open source or proprietary 3D mapping/libraries. I have checked ...
4
votes
1answer
1k views

Importing multiple shapefiles into single PostGIS table

I have a folder full of shapefiles that I want to import into a single PostGIS table. This table should have the following columns: id, filename, multipolygon I can bulk import all shapefiles using ...
5
votes
3answers
1k views

How do I get the value of the pixel under the cursor?

Is there a tool or something that will give me the value of the pixel under the cursor? What I've got in mind in something like the eyedropper tool in graphics programs that allows you to ...
1
vote
2answers
258 views

Create line between polygon and nearest raster cell

I need to create a line between polygons (centroid) and the nearest cell of a raster dataset. The polygon and raster do not intersect. Each polygon has a UID. One cell can be linked to many polygons, ...
0
votes
0answers
70 views

How to crop google hybrid map in QGIS? [duplicate]

I download google map from openlayers plugin in QGIS, it was like this: How can I crop the view to get a certain area from the map like this:
2
votes
0answers
349 views

Geodatabase Connection to Oracle Active Data Guard Standby

Thank you in advance for any help you can provide. ENVIRONMENT Database Server: Oracle 11.2.0.2.0 Single-Instance Database on Windows Server 2003 R2 Enterprise 64-bit Oracle Active Data Guard for ...
2
votes
1answer
145 views

Problem while Reprojecting

When I try to transform geometries from SRID 2321 to 4326, the transformed coordinates are swapping. Why is this happening? Below are the details Source SRID - EPSG:2321 Source Data Projection ...
0
votes
1answer
349 views

Geometry Transformation in Spatialite 4.1.1

I am trying to transform a geometry (geo referenced to Australia) POLYGON((-33.917172 151.110971,-33.916443 151.112495,-33.917637 151.113276,-33.917783 151.111512,-33.917253 ...
0
votes
0answers
130 views

Extract city boundary from TIGER data

I'm trying to find the bounding box of US cities but I just can't seem to figure out what to do with the TIGER data I download (not to mention, which data to download!). Could someone experienced with ...
4
votes
1answer
442 views

How can I add grid lines to a print composition using pyqgis?

I'm writing a qgis plugin to create an image in the print composer of the current map. I can get the map rendered in the proper place with a frame of the right width, and I can get grid annotations ...
2
votes
1answer
517 views

how to create CF-compliant NetCDF from ESRI Grid?

been trying to make a CF-compliant netCDF file from an ESRI Grid. I want to serve it w/the THREDDS server. Been using gdal_translate. I know the netcdf output option is definitely not CF compliant, so ...
3
votes
3answers
2k views

How to Populate new field using expression containing MAX value from another field in ArcGIS attribute table using field calculator?

I've got one field X with 10 numerical attributes (float/double). I've created a new field Y (also float/double) which I need to populate with the percentage of each record/attribute (in each of the ...
1
vote
0answers
81 views

How to convert overlapping polygons in single layer to raster by count in QGIS?

I'm trying to do this in QGIS 2.0 (Mac Mt Lion). But cannot do step 2, as I can't dissolve original polygons by 'count' in QGIS (in that tool at least). Advice?
1
vote
0answers
195 views

Traversing all possible road routes

I have created a topology from OSM data and would like to simulate a car driving every possible route along the map. The purpose is to "survey" the osm data as if in a car. My ultimate objective is to ...
0
votes
2answers
373 views

How can you create a KML that is synced to CartoDB data and styles?

the one part of cartodb i am struggling with is connecting my table or visualization to google earth. I see that you can export an un-styled kmz from a table. Has anyone figured out a way to keep a ...
1
vote
0answers
722 views

Linear Referencing : Locate Features Along Routes [closed]

I've ran into a bit of a roadblock using this tool. I have roughly 3 million points that coincide with 200,000 routes. My routes have the From/To measurements, and my points contain X,Y data for ...
1
vote
0answers
113 views

QGIS over WatchGuard Mobile VPN with SSL

something quite strange occured today. I connected to my office through WatchGuard Mobile VPN with SSL enabled. I got loads of errors about SSL certificates, WMS errors (there were WMS layers in the ...
0
votes
1answer
78 views

How to add a vector layer in QGIS in python

Someone please can help me how to start with the library qgis ? At first, i'd like to know, by clicking in a button on my litle plugin that i created for QGIS how to add a vector layer with python ...
1
vote
1answer
695 views

Calculating Stream Length-gradient Index (Hack Index) with the field calculator

I'm trying to calculate the Stream Length-Gradient Index of a stream (example data below). Just started to get into python, but am struggling with a solution to this problem. I have 42 streams to run ...
0
votes
0answers
383 views

Contour tool in ArcGIS 10.1 giving syntax errors [duplicate]

I am trying to run the contour tool on a raster in 10.1 and get the following error messages? Does anyone know if this is a bug and is there a work around? ERROR 010328: Syntax error at or near ...
3
votes
2answers
56 views

Average Proximity Metric

I'm looking for a metric that gets at average distance to a given feature. For example, for a point in the water, how far, on average, is the land or to what extent is the point surrounded by land. ...
4
votes
1answer
1k views

PostGIS intersection function

I have a problem with intersection function. I built my query following http://manual.linfiniti.com/en/postgis/geometry.html, 5.7 section. I made my clip object, a red linestring frame: But after ...
0
votes
1answer
478 views

How to create an Isopleth map?

I'm looking for a plugin for QGIS that would allow me to create an effective isopleth map. Does one exist? I haven't been able to find any, only independent software that would allow this type of ...
1
vote
1answer
201 views

I can't seem to use arcpy.mapping print command. It's not displaying the mxds in the loop

Here's the code for the third parameter that list the local printers: # Third Parameter printer = arcpy.Parameter( displayName="Select a Printer", name="printer", datatype="String", ...
0
votes
2answers
1k views

How can I download maps from mapquest?

I need to get a detailed map for my own purposes. I need it detailed as much as I can see the buildings (like google map hybrid mode). I went to http://open.mapquest.com/ but I couldn't find the way ...
1
vote
1answer
510 views

Error: Coordinate values are out of range [-180 -90, 180 90] for GEOGRAHY type on Postgis?

when I run a query on Postgis select st_astext(ST_SetSRID(f.geom,4326) ),st_astext(st_centroid(ST_Transform(b.wkb_geometry,4326))) from a,b where ST_Distance_Sphere( ...
0
votes
0answers
158 views

Exporting basemap & Layers as an image?

I need a open-source server-side component for a web-application that can export basemaps + layers to an image format (saved on a db). Being slightly new to GIS, I've managed to find a few tools that ...
6
votes
4answers
1k views

Sqlite, Python 2.7 and Spatialite

I am trying to spatially enable my sqlite database: import sqlite3 db = r'c:\temp\mydata.sqlite' conn = sqlite3.connect(db) conn.enable_load_extension(True) cur = conn.cursor() cur.execute(r"SELECT ...
0
votes
0answers
264 views

Secured ArcGIS Server map service gives 2048 error in FLEX application

I have a FLEX app up and running on a web server. It is accessible externally from the internet and runs perfectly fine if the services in the app are not secured in ArcGIS Server. So the crossdomain ...
1
vote
1answer
175 views

With ArcGIS Server, can you have a dynamic service combined with a map cache?

What I would like is a single ArcGIS Service that caches at the largest levels (state, regional, city) but is then just dynamic at sub city levels. From what I'm reading and understanding -- I think ...
1
vote
1answer
488 views

Category colors on torque

I’m trying to create a torque viz on the CartoDB dashboard following this StackExchange post: Using different colors on Torque CartoDB I followed that answer, but my marker colors are still all the ...
0
votes
1answer
128 views

Changing CRS for basemap from OpenLayers plugin

Relatively new to QGIS here and I haven't been able to find this question answered yet. I'm working on plotting data from NYC (Queens, specifically) and I would like to overlay my heatmap on a basemap ...
2
votes
3answers
444 views

How to generate dartboard shapefiles using ArcGIS for Desktop?

I am rather new to ArcGIS and I have a simple question regarding a problem I cannot fathom. I am attempting to generate a polygon 'dartboard' shapefile. Radially, there should be a circle from 0 to ...
6
votes
2answers
1k views

How to force 1-bit raster output in ArcGIS 10.1 for Desktop?

Any ideas on how to force a 1bit raster output in ArcGIS 10.1? By default, ArcGIS is being very dense about recognizing pixel depth. I have a binary raster [0,1] and a mask raster [1] and they are ...
9
votes
4answers
476 views

How to change the “W” (English) to “O”(French) on the North Arrow direction using ArcMAP 10.0?

How to change the "W" (English) to "O"(French) on the North Arrow direction using ArcMAP 10.0? I tried to convert the North Arrow sign to graphic but it didn't work.
1
vote
1answer
898 views

Finding the correct Web Server Base Folder URL - ArcGIS Viewer for Flex

When getting started with ArcGIS Viewer for Flex I enter the following details; Web Server Base Folder: C:\inetpub\wwwroot\flexviewers Web Server Base Folder URL: my machine name followed by the ...
1
vote
0answers
120 views

How to get intersected points between polygon and line in desired order

I have polygon for example "POLYGON((5 1, 6 1, 6 5, 5 5, 5 1))" that I want to intersect with line "LINESTRING(0 2, 10 2, 10 3, 0 3, 0 4, 10 4)" and get intersection points in the order that they ...
0
votes
1answer
360 views

GeoExt: Layer leaf nodes replicated across all tree nodes

This is going on with GeoExt 1.1 and OpenLayers 2.12. I need to build a layer tree dynamically, with layers and nodes that are only known at run time. The snippets I show below correctly create a ...
0
votes
1answer
312 views

Flow mapper plugin failed

I want to create a desire line with the Flow Mapper plugin using QGIS version 2.1. After I did, it has failed. The data that I used is pictured below. There may be an error procedure I have used. Can ...
0
votes
2answers
4k views

PostgreSQL function does not exist

I have PostgreSQL 9.2 with Pgrouting extension, but when I want to call a function(pgrouting) does not work. Id like to compute the shortest path between two point. SELECT gid, AsText(the_geom) AS ...
2
votes
3answers
703 views

Display multiple attributes for one point

I am using ArcGIS 10. How can I display multiple attributes for a single point. For example, I would like to display (graphically if possible) the amenities provided at various recreational areas... ...

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