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How to install a spatial database (Postgresql + Postgis) أكثر...

Bonjour à tous, je suis sur Access 2007 et je cherche a créer un ruban personnalisé pour éviter que les utilisateurs n'aient accès aux outils de modifications de formulaire, création de tables... J'ai donc suivi cette page qui explique comment faire:... أكثر...

Salut, J'ai voulu géoréférencer un dxf en me basant sur le script proposé par Lud (http://www.portailsig.org/content/qgis-2-script-et-methode-pour-faire-du-georeferencement-vectoriel) et ce tuto (http://gisforthought.com/georeferencing-vector-data-using-qgis-and-ogr2ogr/) Mais j'obtiens ce...

NASA/ARC is interested in spaceflight-qualified LIDAR systems for planetary rover missions on the Moon. LIDAR is a remote sensing method that uses light in the form of a pulsed laser to measure... Click Title to Continue Reading... أكثر...

I have to calculate the slope of a line based on a dataset of points with a height value. I am doing this by calculating the slope over a raster created using the trend function (linear 1st order). when i create the raster using the trend function I get also an RMSE value and the chi^2 value. I...

في هولندا تم الكشف عن أول طريق في العالم للدراجات الهوائية يُلِد طاقة شمسية ويستفيد منها، وهو مشروع تكنولوجي ثوري يمكن أن يطبق مستقبلا على الطرق العادية. المشروع يسمى "SolaRoad"، وهو عبارة عن مسار خاص للدراجات الهوائية يتكون من وحدات خرسانية، أبعاد كل منها 2.5 × 3.5 متر، مزودة بألواح شمسية،...

I am working on drawing points/segments/polygons on a map , that uses OpenLayers 3. The first part i have done , it draws points/images , makes segments/polygons etc. Now i am trying to retrieve added elements points(coordinates) , in order to build them for other sessions. My current progress...

My map in Openlayers (Ol3) contains a WFS layer with GeoJSON format from Geoserver. My intention is to use CQL filters that can be applied by the user through comboboxes next to the map. The CQL filter works initially but I cannot get the layer to reload with the modified CQL once the url of the...

I'm working with ArcGis 10 and I need to show the name of the streets along the street line. I want to increase the distance of the label from the line and I saw in the Label Tab I can control this by changing the offeset in Placement Properties, but I fear this option does not work when the...

If I have say 3 overlay features; A,B,C each has a field called FIELD_ID If I do a union, I will get 3 new fields in the output: FIELD_ID_1, FIELD_ID_2, FIELD_ID_3 But how do I get just one summary field 'FIELD_SUMMARY' that contains the values of FIELD_ID_1, FIELD_ID_2, FIELD_ID_3 for each...

Looking around I noticed that many people interchange the terms (triangulation and trilateration) for the same sense. What is the correct sense of Triangulation and what are the differences from Trilateration? أكثر...

I'm working on ArcMap 10 and need to get the lenghts (in meters) of the segments composing my line feature class. CGS of the line is WGS_1984. I thought the correct way was to switch the Data Frame to PCS: WGS_1984_World_Mercator in order to get metric lengths with Calculate Geometry in a newly...

Explain which one is the best way to survey a land, from traversing, triangulation and trilateration? أكثر...

I am able to load the multiple wfs features using GeoJSON, but now i need to load the features dynamically instead of loading randomlyHere is my code // First WFS Layervar url = 'http://localhost:8080/geoserver/wfs?service=WFS&' + 'version=1.1.0&request=GetFeature&typename=WFS:Layer2' +...

Trying to update field in a feature Without "attInspector" ...Using ArcGIS JavaScript I cannot find any changes in the field. Please, help me out. My code: for (var i = 0; i < features.length; i++){ feature = features[i]; feature.attributes["X"] = Value...

I have an empty raster shapefile that only contains the latitude and the longitude of the centroids of each grid. I now want to add an extra variable to each grid cell coming from a cvs or txt file. In this text file, latitude and longitude of the centroid of each grid is also included. Even...

When I run the next code at the Python Console of QGIS with a line vector layer: symbol1 = QgsLineSymbolV2.createSimple({'penstyle':'solid', 'color':'black', 'width':'3'...

I extracted nodes from polygon parcel layer by Geometry Tools > Extract Nodes. However there are many crossed unnecessary points with same location after extracted nodes. There is a topic like this: Join attributes by location Is there any way to simplify unnecessary points? أكثر...

Bonjour à tous, je cherche un batch (j'imagine), qui permet de mettre les coordonnées du premier pixel en haut à gauche d'un raster un peu comme cela est fait pour les ortho ou scan. Je pense pouvoir les inclure dans le nom si j'arrive à les récupérer, par contre je n'arrive pas à "extraire"...

Bonjour, je cherche le moyen d'exporter ma carte en format PDF mais un PDF dynamique c'est-à-dire avec la possibilité de pouvoir cocher ou décocher les couches, à la manière des calques sous illustrator? أكثر...