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10
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2answers
2k views

How to implement viewshed calculation?

I'm looking for a way to implement visibility (aka viewshed). I found a previous GIS SE question that suggested a few GIS applications (not what I need - I'm trying to embed the calculations), and ...
9
votes
1answer
6k views

Characteristics of different methods to convert ECEF to LLA

I'm trying to convert ECEF (Earth Centered, Earth Fixed) coordinates, which are defined in X,Y,Z, centered at (0,0,0) to LLA (Latitude, Longitude, Altitude). There are a couple of methods I found on ...
7
votes
1answer
2k views

How can i create sectors for telecom towers

friends i am seeking advice from the GIS community I work in the Mobile networks industry and i took up a task to create a plugin for QGIS using c++/python that does the following: step 1: Create ...
6
votes
1answer
647 views

Slow FileGDB Performance in GDAL

I am attempting to write many ASPRS LAS point files into an ESRI File Geodatabase using my compilation of GDAL 1.9.2. The FileGDB driver for GDAL/OGR appears to be incredibly slow when writing large ...
6
votes
2answers
2k views

Where can I find documentation on QGIS C++ Plugin Development?

Is external C++ plug-in support available for QGIS? I'm having a really hard time getting started here. I followed the doc here: ...
6
votes
2answers
1k views

How to get latitude, longitude and altitude database from a GeoTIFF file?

I am developing an AR iOS application. When the iPhone gets the current location, it has to calculate locally the visible point. I want to read the tiff files in my application, and then get the ...
6
votes
1answer
3k views

Setting up an application in QT Creator that uses QGIS API

I am a 15 year veteran of Java making my first entry in to C++ applications. I have a specific need to develop a desktop application that produces graphics type output as well as displaying imbedded ...
6
votes
1answer
1k views

C++ Code Examples in Quantum GIS 1.8

I am trying to utilize the C++ code examples from blog.qgis.org, specifically Tutorial 4, Adding Rasters to QGIS Map Canvas. I am successfully able to run the example loading a GeoTIFF with QGIS ...
6
votes
1answer
282 views

What's a robust strategy for displaying 3D map data for navigation?

3D map data, specifically the kind you see on GPS units, or more recently on smart phones, almost always features a 'HUD' like view, which I'm trying to implement in an application of mine. I have ...
5
votes
1answer
862 views

How to use GEOS/C++ to efficiently find all point pairs closer than a threshold?

Can anyone tell me how to use GEOS/C++ to efficiently find all point pairs in a dataset closer than a threshold distance d? I suspect this might involve quadtrees or rtrees but not quite sure how ...
5
votes
2answers
1k views

GDAL in C++: Reading a ShapeFile

I am trying to use the GDAL Lib to read a ShapeFile (.shp). I followed the instructions of http://www.gdal.org/ogr_apitut.html - But it doesn't work! #include <gdal_priv.h> #include ...
5
votes
1answer
111 views

Is it possible show the feature attributes dialog when I add a feature in code?

I want to know if it is possible to make the feature attributes dialog in Qgis show up when I add a feature by code using: QgsVectorLayer::addFeature( tFeature ) This is available when I add ...
5
votes
2answers
649 views

How to filter the MouseWheel event in a QGIS C++ plugin?

I’m developing a C++ plugin for Qgis and I want to filter/override the mouse-wheel event. I created a “maptool” to select a polygon feature on a vector layer, the feature has two attributes : an id ...
4
votes
3answers
3k views

How to subset raster image using gdal?

I have read pixel values of an raster image using GDAL libraries in visual studio 2010(vc++). Now I have to crop the image (subset) according to the grid given in shape file. I have got a code for ...
4
votes
2answers
239 views

Is there a GIS-Tool that fit my needs? [closed]

I´m working on a GIS-Project in the Defense & Intelligence sector. The goal was to develop/create a GIS-Service that: stores and manage GIS-Data (Map data, Height data.. ) has a repository for ...
4
votes
2answers
2k views

How to store raster data in spatialite?

I want to cache my raster data(large geotiff files) on local database. I thought to use spatialite. I found librasterlite which provide functionality to do that. Can anybody point to some tutorial on ...
4
votes
2answers
1k views

combine raster with another raster mask file - gdal

I have 2 rasters in GeoTiff format. One has all of the land and water and the other is a mask file that shows either 0 for water or 1 for land. I basically want my output to just have the land values ...
4
votes
2answers
87 views

IRasterLayer background transparency in C++ with ArcObjects 10.x .NET

I have a georeferenced IRasterLayer which is displaying data from a PPM file with no alpha channel. I am trying to specify a color which should be treated as transparent. In ArcMap it is possible to ...
4
votes
0answers
125 views

What is the structure of Standard Interchange Format (SIF) used by spatial data providers?

What is the structure of Standard Interchange Format(SIF) used by navteq and other spatial data providers? Any documentation/sample files? Is there a SIF parser available in C/C++/Java/PHP ?
3
votes
2answers
110 views

How to create a dashed polygon border in C++?

In my maps I have a symbol, his type is polygon, I want to change the line style of the border, actually is solid , I had to put it in dash Is there a simple way to change it ? i think to the ...
3
votes
1answer
201 views

How to refresh layers independently?

I'm writing a C++ application using QGIS API and I would like to improve the performance. I want to render 5 layers: one raster layer using gdal to load Bing/Google Map tiles 4 custom QgsMapLayer ...
3
votes
3answers
900 views

A linestring merger algorithm

I'd like to merge linestrings which touch, but do not cross. The linestrings share the same SRID and come from a PostgreSQL 9.2/PostGIS 1.5 database. Within the table I query are several line strings, ...
3
votes
2answers
1k views

Finding the minimum and maximum distance between an observer and a lat/lon bounding box

I have three points in geographic coordinates (latitude, longitude, altitude). One of the points represents an observer, above the Earth. The other two points define a bounding box. I'd like a ...
3
votes
1answer
184 views

Build ESRI addin with C++

Is it possible to build an ESRI addin (.esriaddin) using C++? I see templates for .NET and C# only but perhaps there is a manual method?
3
votes
1answer
2k views

Is it possible to query via bounding box in the Google Maps Static API?

We have a Qt program written in C++ to request wms tiles and display them. This works fine. Now we want to display imaginery from Google Maps and due to some restrictions in our program, we can't use ...
3
votes
1answer
18 views

Help with Meters at Lat calculation accuracy, two methods

So I'm coding a program (c++), and thing leads to thing, and I need to find out how many meters to a degree of longitude at a specific latitude to a very high precision. Optimally < 1 meter at all ...
3
votes
1answer
291 views

DEM creation with C++ application

I am implementing a C++ application that must produce DEMs from LIDAR data. I am following the next workflow: Write .las files from lidar data. Use PCL algorithms to transform/filter the point ...
3
votes
1answer
2k views

circle detection on binary image

My image is gray scale image which i have converted to binary by smoothing and then edge detection method. Now i want to place the circle /ellipse on edge detected. I don't know how to proceed ...
3
votes
1answer
1k views

QGIS Plugin Windows

I have written a QGIS plugin (RTools) which acts mostly like a independent plugin (minimal interaction with QGIS core functions). On Linux both QGIS and RTools were build using QT 4.8 on Qt creator. ...
3
votes
3answers
468 views

Installing the development files libqgis-dev in Ubuntu 12.04

I am trying to install development files which include the headers and the libraries for qgis in Ubuntu 12.04. I used Ubuntu software center, synaptic and the terminal and am still getting the same ...
3
votes
1answer
82 views

Extracting values from raster under line using GDAL?

How can I find the cells which lie on a straight line between two points? I.e. how can I find the indices of the cells (in grey) which are intersected by the line defined by the two points (in blue): ...
3
votes
2answers
337 views

Fastest Way to Intersect Envelope with Multiple Feature Classes ArcObjects

I have the situation where I am doing a large number of intersections and I need to do them fast. The situation is I have a iMap with 1 or more layers and a series of envelopes, lots of envelopes. I ...
3
votes
1answer
816 views

Using GDAL to connect to a WFS

I'm trying to connect to a wfs using GDAL, from reading some of the (fairly sparse) documentation on this i have found that this is possible if GDAL is compiled with the correct drivers (Curl, ...
3
votes
1answer
1k views

How to get elevation with LibGeoTiff?

I'm trying to get an elevation profile from a geotif file ( downloaded from http://srtm.csi.cgiar.org/). I downloaded the libgeotiff library but i can's see any function that can return an elevation ...
3
votes
2answers
38 views

Converting Python GDALDataset to C++ GDALDataset

I'm currently writing a C++ extension to python to speed up a raster data viewer which is running extremely slowly with our large datasets. I've managed to get a small speedup by writing a C++ ...
3
votes
1answer
59 views

ArcGis 10.2 returning an enum status of EsriLicenseNotLicensed

I have an old VS project that was using ArcGis for a map control. I now have 10.2 on my machine. code that I used previously to find & initialize the license no longer works. I know the enums ...
3
votes
0answers
91 views

GDALRasterizeGeometries doesn't burn correct Values

What I have is a vector shape file with a string field. What I've done is written a CSV file with the field ID, field_value and now I would like to rasterize the vector layer as a byte raster with the ...
3
votes
0answers
98 views

How do I get the domain from an OGRSpatialReference?

I would like to know what the projected bounds are for a spatial reference using OGRSpatialReference. Is there some way to use the GetProjParm method to get this information? An example of what ...
2
votes
4answers
2k views

Offline Python or C++ library for plotting locations on map?

I'd like to plot locations using longitude and latitude coordinates using Python or C++, is there a good library for such a task? I know that matplotlib is an option, I'm wondering if there are any ...
2
votes
5answers
2k views

How do I turn a GeoTIFF file into a bmp file?

I need to get GeoTIFF files transformed into bmp files so that I can display them as apart of some software that I am working on. Unfortunately, I am a total newbie with GIS and really don't know much ...
2
votes
1answer
1k views

QGis Plugin Licence

I would like to create a plugin using commercial software. Does the QGis licence permit this? Are there any restrictions on the licence I can choose to apply to my plugin?
2
votes
3answers
285 views

Given (lon,lat), how can I quickly retrieve the containing administrative region?

Given a coordinate (lon,lat), I'd like to retrieve the containing administrative region (state/province level) for an offline mobile application. The method employed needs to be fast/efficient. ...
2
votes
2answers
643 views

Error getting ESRI Shapefile driver OGR in C++

I am unable to create an OGR Layer using the C++ API. I have followed the documentation at this link exactly http://www.gdal.org/ogr_apitut.html I get an error trying to get the shapefile driver. Any ...
2
votes
3answers
613 views

C++ coordinate class that automates projection?

Can anyone point me to a C++ class for representing coordinates that automatically handles projection transforms? What I'm thinking of is something that would allow me to create vars that incorporate ...
2
votes
1answer
986 views

Looking for QGIS 2.4 C++ Hello World example?

In the project I'm working on (C/C++/Qt application), we are trying to integrate QGIS (latest version desirable, 2.4 for the moment). But there is very little information in the web on how to use QGIS ...
2
votes
1answer
493 views

Rearranging labels in screen to avoid overlapping

I have a map, with some icon over it. Every icon has a label next to it. When icons overlaps, labels are overlapped too. In this case, I want to move labels so they don't overlap anymore, with a line ...
2
votes
1answer
316 views

How to port QGIS C++ plugins to other QGIS installations?

I developed a C++ plugin for QGIS using VC++ express 2008 and a QGIS dev release (1.9.90 alpha), my plugin works fine on this release and now I want to port it to other QGIS installations, so I copied ...
2
votes
1answer
48 views

Fastest way to process OSM

I've been working with imposm and Python, it's fairly easy to parallelise. I've hit a performance problem when trying to associate the coordinates to the ways. Creating a dictionary from ...
2
votes
3answers
399 views

Using GDAL/C++ to calculate distance in meters

I'm using GDAL in C++, with WGS84. I want to calculate distance between two points in meters. The code snippet below tries to find the distance between 25N/75E and 25N/76E. The code, as is, returns ...
2
votes
1answer
735 views

How to develop c++ standalone QGIS C++ Application

I want to integrate QGIS in QT\C++ application. I try to write basic C++ apllication to render map and build it using MSVC 2010. class PostGisViewer: public QMainWindow { public: PostGisViewer(): ...