A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane

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20 views

How to georectify a fictive earth to a projection-less version

I have a picture of a fictive earth-like world. Now I would like to draw the outlines and then georectify this to a projection-less version. I really need the map unrectified. Because I want to ...
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86 views

help with TMS (gdal2tiles) Openlayers 3 and custom projection

I work with a local italian projection (EPSG:3003 Monte Mario Italy zone 1) and I had loaded this projection in my project for evitate to reproject all of my data. I had created the tile pyramid with ...
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34 views

Correcting the shift of MapInfo data in QGIS 2.6 (and earlier too)

I often receive multiple .mif or .tab files and view them alongside shapefile layers in QGIS 2.6.1. Dragging one of the .mif files from a Windows Explorer window into a QGIS window will display the ...
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25 views

polygon will not project correctly into project

I have a project that one shapefile( I believe created in arcgis) layer mysteriously quit projecting correctly. I am using Q 2.6.1 On the fly is enabled, coord system set at EPSG:4326 - WGS 84, when ...
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43 views

Is there a formula for calculating 2D map distance from 3D information?

Using ThinkGeo, I have a Lat/Lon coordinate, and a distance of .1 miles. The .1 miles represents the radius of a circle and I'm trying to draw this radius around the lat/lon coordinate. The map units ...
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26 views

Projection of COSMO-EU?

I have data points of COSMO-EU data stored in WGS84 coordinates. Now I try to transform them into coordinate system where the points becomming arranged to a regular grid. Does anybody knows the Proj4- ...
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57 views

GeoTiff using GDAL

How can I project a tiff using the position of the four corners where the picture have to be placed ? The tiff file has no georeference or projection information I have got a grid with values of ...
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42 views

reprojecting (unprojecting) in MrSID decode (SDK)

I am using the C++ SDK (version MrSID_DSDK-9.1.0.4045-win32-vc9). I'm trying to read in arbitrary .sid files and extract rectangular sections of them that can be displayed on top of a "web mercator" ...
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33 views

Pros and Cons of a latitude adjustment grid vs other methods of area calculations

When working with high resolution global raster data in WGS 1984 I often need to calculate areas. Now the traditional way for me to achieve this has been to reproject the data to an equal area ...
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43 views

How can one use Google Maps API to mimic QGIS projection/CRS

I used QGIS to find the extents of a list of features. However, the resulting data auto-generates the CRS and changes it from WSG84 to a custom one. Is there a way to use the autogenerated CRS in ...
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51 views

Precision loss when transforming coordinates systems in GDAL (vector layers)

Anybody knows the order of magnitude of the error introduced when transforming coordinates using GDAL? More specifically, I would like to know if significant error is introduced when the ...
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299 views

Transforming between epsg:3857 and Google Maps Tile coordinates

Hio, I used to use a simple python project (https://github.com/hrldcpr/mercator.py) to convert between wgs84 and google maps tile coordinates. This project doesn't have a license, and looks like it ...
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26 views

How to get ASTER level 1B data to overlay correctly on google earth/ bing maps/ arcmap imagery basemap

I have recently purchased Two granules of ASTER 1B data from ERSDAC. Upon importing this data into arcmap 10.2, the layers representing each band were specified as being projected in: ...
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88 views

Striping Artifact in Aster DEM Mosaic

I'm working with SRTM and ASTER data for a university project. My goal is to delineate watersheds and evaluation of these with ArcGis 10 and ArcHydro. But a striping error occurs with the flow ...
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82 views

How to generate map tiles with TileStache and a custom projection

I would like to generate my own map tiles using TileStache and a custom projection. I have been struggling with this for quite some time and am hoping I can get some advice to get the tiles to ...
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75 views

Understanding X Y coordinates: geocode before or after projecting? What determines how many decimal places?

I am trying to figure out how different my groups' past Network Analyst analyses have been because they were using a geographic instead of projected coordinate system. But I'm getting hung up on the X ...
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64 views

Is it possible to rotate the geographic projection in QGIS?

I'm trying to create a Qgis plugin that can rotate a raster layer in the canvas so that the north is pointing at another direction. Unlike the thread below, I'm open to defining a custom projection. ...
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48 views

Euclidean Distance Function performed on unprojected data

I am looking to perform a simple multi-criteria analysis on a data set comprised of two criterion: occurence of wildfires and road accessibility. First, the project CRS was enabled with "on the fly" ...
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229 views

Fixing Mapinfo export to Google Earth projection which is slightly off?

I have around 20 layers of data (points and polylines) in Mapinfo TAB files which I need to export to KML files, however the projection is slightly out. I have tried various different projection ...
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126 views

Creating a custom Lambert Conformal Conic projection in ArcGIS 10.1 and/or 10.2.2

referring to the table below, I am trying to use the values on the left from another program that uses different terms for the parameters of a custom projection. I just wanted to make sure that ...
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58 views

projections Basemap and pyproj

I am struggling to understand the projections using pyproj. for now my question is to understand the results of projection operations I have following coordinates that I project on x,y lon = ...
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42 views

cs2cs works one way but not the other

I am trying to build a short program using cs2cs that will work on any windows pc I copied cs2cs.exe and proj.dll to a seperate folder When i run this to convert israel tranverse mercator to decimal ...
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77 views

gdal read whole geotif band into vector

i have another c++ GDAL question. I try to read alle elevation data out of an GeoTiff file into a c++ vector so that i can get elevation at x,y like this: vector[x][y]. I also like to use this data to ...
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44 views

Mapnik projection for rectangular coordinates

I am trying to use mapnik to render indoor floorplans and am having a little trouble figuring out the SRS projection. I have geoJSON that represents the floorplan. The coordinates are just cartesian ...
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43 views

50m x 50m grid around the world

I'd like to subdivide the earth into a grid of approx. 50 x 50 m cells (big database, I know). To make it more complicated (and fun), I also need to be able to determine to which cell a given set of ...
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100 views

km measurement in qgis with EPSG 4326

I'm struggling with a small issue. I'm working with the master version of QGIS and I have some layers loaded in my project. All the layer are in 4326 projection and the on the fly option in NOT ...
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56 views

Assign a particular projection for un-projected raster/vector files in a folder/sub-folders

We are having 1000's of raster images/vector (shp,tab,dxf) files in a folder/sub folders. Is it possible to check the projection of those and if it is an un-projected one? WGS 1984 has to be ...
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63 views

Cause of MODIS Reprojection Tool errors?

I have installed the MODIS Reprojection Tool (mrt) and it says the installation completed successfully but it does not mosaic my images properly. However, there seems to be some projection errors. ...
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23 views

calculation precision during projection transformation

I am using wgs 84 base tiles, and the tile is not rendered as image but with geojson format. I try to draw them in the tile according to the data. And the geometry of the returned feature is lng and ...
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111 views

leaflet.js ImageOverlay projection bug

We are trying to display a image over the leaflet map using "ImageOverlay" layer, but it does not work according to expected. In Google Maps works perfectly. Apparently Leaflet just stretches the ...
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47 views

Raster projection problems

How would I go about specifying the following projection in Arc and QGIS? After defining this, how would I then go about changing the spatial reference to ESPG 27700? The following are the details of ...
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131 views

TileStache : Unknown geometry type in geoJSON file

I'm currently trying to set up a TilSstache server on Ubuntu 12.04 to serve some GeoJSON tiles from a shapefile/JSON file (administratives boundaries) for a web mapping project using the Leaflet ...
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23 views

buffer in qgis from layer text delimited

I have a layer of polygons in British Columbia, Canada in WGS 84 which is fine. Later I created shapefile of three points (using decimals for lat and long) through the add shapefile as text delimited ...
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127 views

CartoDB - problem trying to add a geoserver WMS as a basemap and it says it doesn't contain supported projections (3857,900913)

I had suspected that the version of geoserver (2.0.2) did not support these 2 EPSG's . However, when I then look at the getcapabilities - I find that both EPSG's are present. ...
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127 views

Kartograph - “projection not named”

The Kartograph package looks very promising, so I have been trying play around with it. As it turns out, I have been able to get the most basic map to work (the "world.json" example), but I could not ...
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76 views

QGIS: Albers projection in lat lng?

I'm trying to make a map of Russia in the Albers projection. My projection string is: +proj=aea +lat_1=45 +lat_2=70 +lat_0=40 +lon_0=100 +x_0=20 +y_0=20 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m ...
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308 views

gdal python set projection of a raster - does not work

Gdal 1.9.2, ECW driver: ECW/ERDAS Compressed Wavelets (SDK 3.x) I am having problems with the script that supposed to set projection of the ECW to EPSG:27700, i.e. the British_National_Grid. Please ...
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210 views

Lambert conformal conic projection - Europa

I am trying to calculate map of Europa in Lambert projection. I am using formula from wikipedia (Lambert wiki), but calculation is verřy slow with comparison to Mercator. I know, there are sin, cos, ...
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103 views

Doubt in Field Calculator

I am working in an project.I have a point Shapefile its projection is NAD83(HARN)Pennslyvaniasouth(ftUS)*EPSG3365* when I measure its distance(between two points) it gives me the answer in feet .yes ...
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345 views

openlayersplugin qgis 2.0.1

I have installed qgis 2.0.1, great thing... but.. open layerplugin doesn´t work proper. When I try to load two different open layers I get the answer "could not draw google satellite because:" Also ...
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186 views

why readOGR() is not reading projection information from .spj - r

0 down vote favorite I successfully import a polygon shapefile with readOGR, however the information in the .prj file is not being imported. test class : SpatialPolygonsDataFrame nfeatures : 19407 ...
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349 views

ArcGIS / ArcMap problem with tiff file and projection

I have a raster in ArcMap . The projection is WGS 1984 UTM 22. When I look the details of the projection I can see that the "scale factor" is 0.9996 When I save this raster in a in tif file and the ...
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400 views

Help me convert this US Lambert Conformal Conic Google Maps Projection to Australia

Following on from this question: Identify what projection this Australian map uses? <- this is the sort of map i want to load in I need help changing the bits necessary in this example of Lambert ...
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133 views

Sort a collection of points based on proximity using pythagorean (2D) distance

I would like to present a user with a list of points, sorted by proximity to the user's location. Is there any problem with using the pythagorean formula to calculate the two dimensional distance ...
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74 views

Van der Grinten IV projection. Is it possible and how?

I like the look of the Van der Grinten IV projection with it's two hemispheres and would like to use if for a map of the world. I could only find information on how to use the Van der Grinten I ...
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427 views

How do I redefine the projection of a DEM?

I have a DEM that was exported from AutoCAD civil 3D 2013 but it's in the wrong projection. I'm using an area specific projection that was not provided as an option in CAD DEM export dialog box. I ...
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147 views

Map doesn't show anything in img file (WMS-Mapserver)

Actually in a practical Project we wanted to use OpenLayer and MapServer to display our data using WMS, but We can't find a proper srs or EPSG code. One of the ITC students said, we have to change our ...
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65 views

Why does ERDAS not like my GDAL output?

I am creating a raster using GDAL and the IMAGINE file doesn't work in ERDAS because it doesn't recognize the projection. Here is the code to generate a sample: from osgeo import gdal projectionWkt ...
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149 views

Changing the projection of the output to my OpenLayers click event handler

I've been playing around with the OpenLayers click event handler example, which you can see here. It tell you the coordinates where you have clicked but I am trying to change this to be in decimal ...
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88 views

Why does a shapfile shift after transformation?

I have a shapefile created in the raster package (ER_14.3_2000_poly). > #read in a raster file > ER_14.3_2000<-raster('E:/Ecoregions Models/Outputs/ER_14.3/ER_14.3_ConsensusMap3.asc') > ...