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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Projecting a Raster from WGS84 to planar Equal Area to Calculate Area: How to Select the Cell Size?

I have a broad question on how to calculate the 'correct' cell size for a raster when analyzing an area not at the equator. My goal is to project a land cover raster provided in GCS WGS84 to an equal ...
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1answer
73 views

Images displaced in UTM

I recently received a collection of satellite images (GeoTiffs) and their indice. Originally, the indice came in a geographic projection (GCS WGS 1984) and the Geotiffs projected to the appropriate ...
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1answer
694 views

How to make SVG Stabius-Werner projection

I'd like to create a SVG file of a Stabius-Werner projection of the Earth. The image in the linked page is nice in that it's very high resolution (2,058 x 2,065 pixels), but I'd like to see if I can ...
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63 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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244 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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1answer
98 views

is it possible to project a shapefile to a raster's custom projection with command line gdal/ogr?

I have a raster with a user defined sinusoidal projection and a shapefile in lat/lng coordinates (I believe this is called 'unprojected'?). I'd like to use ogr/gdal's command line utilities to ...
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1answer
224 views

GIS - Coordinates / Projections, Google Maps

I'm currently working with OS data and have just tried to import a table of google maps coordinates/point data into ARC. The data frame (& layer) coordinate system is as follows: ...
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34 views

Unpredictable cropping and display of projected geodetic layer in QGIS

Here's the setup: QGIS 1.9.0-master, running on Ubuntu 13.04 I have a two layers and with two different Custom CRS defined The basemap image and project use this one: +proj=eqc +lat_ts=0 +lat_0=0 ...
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1answer
343 views

Manipulating Azimuthal Equidistant Projections in QGIS

I have a shapefile of world countries that is projected as Azimuthal Equidistant with Chicago, USA as the center. I would like to change the projection such that Edinburgh, UK is the center. One would ...
3
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1answer
196 views

Changing the CRS of a shapefile

Im trying to convert shapefile from one CRS to another in QGIS. On the layer menu, I right click on the shapefile, save it as with other name and there I change the CRS to the desired one (WGS 84). ...
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2answers
161 views

How to use OpenLayers OSM-Layer with degrees instead of meters?

I have an OSM-Layer as a base layer. When I create a vector I have to define the coordinates in meter. Is there a way to use degrees right a way without reprojecting them beforehand to meters? var p0 ...
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4answers
216 views

Which UTM system do you recommend for Tamaulipas, Mexico?

I'm working with QGIS 1.8.0. Could anyone tell me which UTM system would be better to project a map of Mexico? There are too many to choose from. I have to convert my maps from WGS84 to UTM to do some ...
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2answers
96 views

Projection 27700 in the OpenGeo Suite SDK GXP

I have some data stored as UK grid references, they display just slightly off alignment on the map after I followed the OpenGEo EXP tutorial using these settings (below) however when I change the EPSG ...
3
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2answers
152 views

Selecting features to project to different coordinate system?

I've got data from all over Europe in one feature class projected in Web Mercator Auxiliary Sphere. Due to the fact, that length and area values are not usable I'm now working on a python script ...
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1answer
25 views

Network segment gaps, when offset

I'm having an issue when offsetting a line shapefile. For some reason when the lines are offset, ArcGIS isn't drawing some segments although the segments are there confirmed via “identify”. Has ...
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1answer
112 views

Is there any library for converting projection transformation in php?

I would like to transform data from lat/long ETRS89 to y/x UTM ETRS89 through php. Any idea?
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1answer
424 views

Geographic Transformations using ArcPy vs. Coordinate Systems used by ArcGis online basemaps

I have 3 shape files with undefined projection, but I know which one it was used (Lisboa_Hayford_Gauss_IPCC). I need to 1st Define Projection. It works. I need to transform it from WGS_1984, so I've ...
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1answer
78 views

Why isn't enabling on the fly projection reflected in raster? QGIS 1.8.0

I have imported a map from the Ordnance Survey Open Data website. It is a 50k Street View raster. I have also created a new shapefile layer in which I have created a polygon overlay for the raster ...
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1answer
162 views

What SRID is this projection?

Anyone know what the SRID is for the following projected coordinate reference system: { PROJCS [ "Florida 0901, Eastern Zone [1983, US Survey feet]", GEOGCS [ "NAD 83 ...
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1answer
78 views

Albers Conic versus State Plane Zone in terms of accuracy

I'm trying to determine if an Albers Conic (Alaska Albers) is suitable as a projection for a corridor 800 miles long by 50 miles wide, that goes from the north coast of Alaska to the south coast. ...
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0answers
409 views

How to set Scale Factor for Lambert Conformal Conic (LCC) projection in ArcGIS Desktop?

The projection for my state according to my country's Mapping Agency is in a specific Lambert Conformal Conic (LCC) projection. They have given values for the following parameters: False Easting ...
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1answer
120 views

How to reproject vector data?

I am evaluating QGIS with a view to visualize and manage geological exploration data. The information is currently stored in different local coordinate systems that I am looking to overlay with ...
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1answer
293 views

Adding Basemap and changing projection - still not aligned

I am using the basemap in ArcMap10 to create a shapefile of hand digitised polygons based on building outlines. However, when I change the basemap projection to Brit Nat Grid, it does not line up ...
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3answers
368 views

Can I use Openlayers Plugin with a different Datum/Projection?

There is probably already a post for my problem, but after long searching, I could not find a solution for my issue. I am working with QGIS und I am using the following projection/datum: MGI / ...
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1answer
100 views

Using ogrinfo to list all projection source of a database [closed]

I have to reproject all the layers from a database, but some of them are undefined and some are defined in a wrong projection. I would like to sort all those layers in a text file with their source ...
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1answer
131 views

Comparing features in GIS interface with Google Maps/Bing Basemaps - Which Co-ordinate system to use?

I want to compare some Geographic features in my data with Google maps in ArcGIS platform using a third party application. But I prefer the output to be in Local UTM cordinates. What is the best ...
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2answers
117 views

How to translate WIGeoEU projection from ArcGIS to Qgis?

I have a Layer with this projection in ArcGIS: ...
3
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1answer
527 views

Setting coordinate system in PostGIS

The geographical information data that INEGI (part of the Mexico's goverment) provides are in the following coordinate system (or is projection?) Lambert Conformal Conic, double standard parallel ...
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0answers
27 views

How to quantify projection distortion using ArcGIS [duplicate]

I am trying to figure out a workflow to quantify the amount of distortion for different projections throughout a given area of interest. I am thinking in the form that you would do a relative ...
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1answer
175 views

Working with Interrupted Goode Homolosine data

I'm trying to use Global Land Cover Characterization data from the USGS: http://edc2.usgs.gov/glcc/fao/data_specifications.php It is in the Interrupted Goode Homolosine projection. As I am working ...
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1answer
187 views

Openlayers and KML layer projection issue

I'm not a GIS expert at all, but I've been asked to add a KML layer to an Openlayers map which probably needs some tweaks and that's where I get confused. Let say I have an Openlayers map with the ...
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1answer
113 views

GeoTIFF without projection?

I have encountered a GeoTIFF raster files with EPSG:4326 (WGS84), i.e. no projection defined! Is this normal? I would expect raster to be in Projected Coordinate System. Raster is a grid of pixels so ...
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1answer
252 views

Point shapefile is not displaying.

I have created a point shapefile in ArcGIS 10.0 that has a geographic projection, but it will not display/draw. When I view the properties it has no "extent" information. Is this the problem? Thanks ...
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4answers
176 views

Buffer in QGIS/R is 650-670 m wide instead of 500 m

I am trying to make a 500 m buffer for my polyline layer. Unexpectedly, I receive buffer varying from 650 to 670 m, depending on location. As many resources recommend to use UTM before making a ...
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1answer
385 views

How to make polygon shapefile containing WGS 84 UTM zones as features?

I need a shapefile with polygon features. Each feature has to be a unique UTM zone (each zone is 6 degrees) in the northern hemisphere. I have no idea how to make it - Create fishnet gives a wrong ...
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1answer
371 views

EPSG:4326, EPSG:3857, JOSM and unprojections

It is said here that EPSG:4326 is not a projection. In my mind, a projection is a transformation of the surface of the Earth producing a flat image, notably a bitmap. We know that WGS84 (World ...
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0answers
109 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 ...
3
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3answers
618 views

What is the formula for calculating world coordinates for a given LatLng in Google maps?

I want to calculate a given LatLng to the world coordinate . I know I can use the internal projection of Google maps like this: var map=new google.maps.Map(...); ...
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2answers
267 views

Calculation for conversion of Lat/Lon to World Geographic Reference System (GEOREF)

Does any one have a reference to, or the actual code, to convert Lat / Lons to Georef code (http://en.wikipedia.org/wiki/Georef)? I am also interested in finding a conversion from lat/lon to MGRS. ...
2
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1answer
134 views

Stumped on python looping and data dictionaries

I have been stumped getting my python code to work for a while now. I've been using python for the last several years on and off for simple things, but I am far from an expert in python. I am trying ...
6
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1answer
233 views

Geometry Projection Speed Test

Lately I've been using the OGR projection classes that come with ogr/gdal, but pyproj was recommended to me, so I thought I'd give it a try. To help me decide if I should make the switch, I did a ...
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2answers
606 views

How can I use GDAL to batch define a projection?

I have a fodler with 1500 ECW rasters, no spatial reference information defined. Can I use GDAL to batch define a projection for all 1500 in the folder?
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57 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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0answers
43 views

CRS centered on the 180 meridian?

The problem I'm dealing with is the old 180 meridian problem, except I'm not trying to plot or render shapes that cross it, I need to do intersections of lines that cross it. The only spherical ...
0
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0answers
107 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 ...
2
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2answers
203 views

Older British Geological Survey geology maps of Kenya; need complete projection information

I have several geologic maps of Kenya produced by the BGS circa 1993. Noted on each map is the following: Projection:-Transverse Mercator Spheriod:-Clarke 1880 (modified) That's great, but that ...
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1answer
184 views

Convert from Mercator to transverse Mercator projection in C++?

I'm writing code to import images from a WMS server into some software. However, the software expects the images to be in transverse Mercator, but the WMS server provides it in Mercator. This ends up ...
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1answer
95 views

openlayers:transform from ITM to 900913 is not accurate

i did a custom projection ITM (Israel TM) and i then am doing transform to all the feature before im adding them to the map, from ITM to 900913 proj because i want to show the feature on the map. this ...
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1answer
189 views

How to compute area for polygons in an EPSG:4326 shapefile?

I have a shapefile covering the whole globe, in EPSG:4326 (geodetic WGS84). I would need to compute the polygons areas in a metric such as km2. How can I do that in QGIS or with gdal/ogr and having a ...
0
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1answer
106 views

Openlayers: transfer from custom projection to map projection

I am building webApp with openlayers that contain a map that allowed insert edit and remove points, my map is now using “EPSG:4326" projection. I have shp files and xlsx files that contain polygons ...