نتائج البحث

I need to add a subquery to a working function. Instead of select * from table, I'd like to select * from (select * from table where height>1500) as sub, something that works in other functions I have. However, it doesn't work in this function. See below: This works as expected: select...

I have never created a database and had some questions while I am doing my research. I need the database to have maps and have access to files stored on my server, I think that is the correct terminology. The server is a shared drive that has files about different companies. I would like to...

I would like to use custom tiles of the size 512x512 pixels with a specific folder structure: "http://localhost/{z}/{x}_{y}_512_512.png"Unfortunately the folder names do not correspond to the common numbering, instead the z-values range from 1-3 with a decreasing resolution and thex- and...

The Problem I'm trying to install an OpenStreetMap server on CentOS 7. I'm using mapnik 2.2.0 and PostGis 2.0. When I try to render the tiles for the server I get the following error: renderd[10581]: An error occurred while loading the map layer 'default': Could not create datasource for type...

I have two raster files: A raster of distance-to-outlet for a creek. Value = 0 at creekoutlet (white), and the maximum value is at the beginning of the creek (black). A raster of Euclidean distances from the creek boundary. Distances arecalculated from creek boundary (red-green). I need to...

i have a shapefile of country subdivisions and i would like to extract an array of bounding lat and lon for each division.. is it possible to do? أكثر...

*Bonjour chers membres et modérateurs, Ravis d'être avec vous dans ce forum, J'aime bien savoir une astuce concernant la jointure, En effet, j'ai effectué une jointure entre deux couches par le champs en commun nommé Lot, mais la table attributaire qui contient toutes les colonnes ne peut...

With the latest release of ArcGIS Online you now automatically get access to free high quality basemaps for Great Britain. We created the new basemaps using the latest Ordnance Survey Open Data products. There are five new basemaps, all designed to be used as background mapping and provide a...

Building more accurate 3D city models is a challenge since no one remote sensing platform is capable of supplying all of the data. This paper presents various aspects of integrating data from... Click Title to Continue Reading... أكثر...

My QGIS 2.8.2 standalone app's mapCanvas fills a central widget with a fixed quadratic size x=y=1000 pixels. When I set the mapCanvas extent() to an area defined quadratic as well given by a QgsRectangle in UTM coordinates, it happens that the extent() gets wider then appropriate. The y-axis...

I am planning to use an API call to something like http://overpass-api.de/api/interpreter?data=... to gather raw GIS data for an application I am working on. Can anyone tell me if that affects my ability to keep my code proprietary, or am I compelled to make my code open source (in a similar...

I am trying to write georeferencing information to a '.las' file using liblas and c++. Here is my code: ofstream ofs; ofs.open("test.las", ios::out | ios::binary); liblas::Header header; liblas::Writer writer(ofs, header); liblas::Point point(&header)...

I'm looking to integrate a GNSS receiver with a Smartphone app. I've found only GNSS receivers that are meant to communicate only with their mobile interface, they don't provide any documentation for integrating smartphone apps in the workflow of using GNSS receivers. Any ideas about...

السلام عليكم ورحمة الله وبركاته يتشرف مركز الخبرة الحديثة للتدريب والاستشارات ان يقدم لكم برامجه المتخصصة في اقوي الدورات التدريبيه التي يحتاجها... أكثر...

A water treatment plant wants to create utility map that allows them to upload data in real-time through a separate monitoring service they subscribe to (through Verizon Wireless) and then use this to trace unaccounted for water (leaks). We do not have ArcGIS for Server and don't have money in...

Please excuse the crudeness of it all. I'm a noob with both python and QGIS. Here's a sample of my code: unique = layer.uniqueValues(index) attributes = layer..dataProvider().fields().toList() assistant_layer = QgsVectorLayer("Point", "temporary_points", "memory") assistant_pr =...

I was reading some literature on spatial modeling, where it is stressed that in using regression (e.g., the Generalized Linear Model family, comprising Logistic Regression for example) the possible spatial autocorrelation of the dependent variable hampers the use of 'traditional' statistical...

I have to create a Polygon on Google Earth which is embedded in my website as it is made in the Google Earth application. I managed to create a polygon already but i can only create it with the javascript file but i need it to function like in the application. Can anybody help me? I searched a...

I want to publish tiff image in browser using Mapserver, for obtaining elevation data. Is there any resource or example regarding this. أكثر...

Bonjour à tous, Voici un lien qui explique comment mettre nos propre symboles SVG dans Lizmap à partir de qgis:http://pastebin.com/YWyjrciK! c'est un lien super interessant mais que je trouve complexe pour ma part. En effet, j'ai un petit problème lorsque j'arrive à l'étape serveur...