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Where does one find authorities on technical aspects of map projections? Would they be professors in geography departments? Or somewhere in government or industry (construing "industry" broadly as including all work not in government or academia)? أكثر...

I am transforming coordinates/points from a pseudocylindrical eckert4 map to wgs84 for use with postgis. The proj4 strings are as follows: eckert4 = pyproj.Proj("+proj=eck4 +lon_0=0 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m +no_defs")wgs84 = pyproj.Proj("+init=EPSG:4326")However, the...

Recently I found a nice tool that generates stratigraphic tables (geology) for free. TimeScale Creator is Java-based (works with Win, Linux and MacOS) and allows you to compose individual stratigraphic tables and show off also with your own data.* Furthermore it’s possible to generate...

I'm trying to run a viewshed analysis of building. My original building layer was a vector which had height attribute. i converted this to raster and added my elevation layer to my building raster layer. i used the output raster "DEMBuilding" as the input for my viewshed analysis but keep...

I'm looking for a way to re-use the technique underneath this OpenLayers example but I don't really understand its structure, especially this part: // This long string is placed here due to jsFiddle limitations.// It is usually loaded with AJAX.var polyline =...

In geoserver, when I edit a postgis raster layer and click on the Dimensions Tab, I can't enable either of the Time or Elevation dimensions. The following message appears next to each of the respective enable checkboxes: Time Cannot enable, no attribute of type Date found Elevation...

I found that just using the "ll" and "z" parameters are enough to zoom in on an area, but I didn't find how/if Google can be told to hide the left panel ("Get Directions", "My Places", etc.) so that users see a full map when visiting a URL: http://maps.google.com/maps?ll=54.868705,-1.593018&z=9...

I'm trying to show all buildings of a certain region in Switzerland using the OSM integration tools for QGIS. Using this answer, I've downloaded and imported data to my project, choosing the attributes "building", "source" and some other, cf. screenshot below: . The tags are basically the...

Kristianstad municipality in Sweden has since 2013 been using QGIS and QGIS Server as a base in our GIS platform. Our goal is to have a user friendly, yet powerful, set of applications from server via desktop and web to mobile applications. All based on open source. QGIS and QGIS server has...

I have a series of 2D maps with values ranging 0.0 to 1.0 spread all over. The algorithm that produces them is an application of the fractional Brownian motion. Each map measures 101x101 pixels or cells. The algorithm producing these maps uses a discretized Inverse Fast Fourier Transform...

I have a data frame with a bunch of polygons, several points per polygon. How can I convert it to a SpatialPolygonsDataFrame object? Here's my data frame: > buildings_df lon lat id1 96.13597 16.83363 convocation_hall2 96.13580 16.83315 convocation_hall3 96.13631...

A have a DEM data 16 bit signed integer format, I would like to convert to 8 bit unsigned integer so that I import it to idrisi selva as img file (erdas imagine file), Iam using arcgis 10.2. How can I go about it. أكثر...

I have a geoprocess that returns a featureset of points. from this i create a feature collection and from the collection i create a feature layer. when i try to attach a heatmap renderer to the layer nothing renders (the layer appears to disappear form the map). i have tried a lot(!) of...

In a country table, I create a region field, ECOWAS, with 1 if the country belongs to the regions 'ECOWAS', 0 else.Country names are in the field "sovereignt".How can I build a field-calculator expression, in which I would list countries belonging to this region?I tried: "sovereignt" in...

Photogrammetry with Multicopter أكثر...

FLEX is the name of an ESA satellite that is planned to be launched in 2022 in order to measure vegetation health from space. FLEX refers to fluorescence. Fluorescence Very generically, fluorescence is the spontaneous emission of light by a substance that has absorbed some kind of...

Greetings earthlings & FME users! I have a Civil 3d CAD file with an attached object data table. The dwg contains only closed polylines and I have a single ODT defined with 30 fields which include text, integer and double, date and guid data types. Everything is attached & visible in Civil 3d...

LecoS asks for the cellsize when calculating landscape statistics. However, there is no such information in the metadata of my input raster layer. Pixelsize is 0.00126545,-0.00126497, but that can't be the required information? What am I doing wrong? أكثر...

با سلام و خسته نباش أكثر...

I'm doing a map to describe trekking paths and I need a button for the geolocation function. I saw ol examples about custom control, button and geolocation, and thanks to the drupal geolocate button I managed to get a map. It works, but I need to a marker to locate the position, and I added the...