The process of translating a map or spatial data from one geographic projection to another

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5
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80 views

Reprojecting elevation dataset for “tilted Earth”

I would like to create maps of a "tilted Earth", such as the following example where Australia is at the North Pole: http://i1048.photobucket.com/albums/s379/laskaris_mods/tilted_earth.jpg I can ...
3
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0answers
375 views

Reprojecting WGS 1984 Web Mercator (EPSG:3857) in Python with GDAL

I am reprojecting rasters in python using GDAL. I need to project several tiffs from geographic WGS 84 coordinates to WGS 1984 Web Mercator (Auxiliary Sphere), in order to use them later in Openlayers ...
3
votes
0answers
305 views

Fortifying re-projected shapefile for ggplot2 in R

I have a shapefile of US county boundaries which I got from the NHGIS. I can load the file using the rgdal package and see information about it: library(rgdal) shp_1860 <- readOGR("shp", ...
3
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0answers
186 views

Bug in gdalwarp's simple nearest neighbor? Or more likely I need some help

I'm trying to understand how to use the GDAL utilities a little better. I think I've defined something incorrectly or I've found a bug in gdalwarp. My bet is that I've defined something incorrectly, ...
3
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0answers
63 views

How can I specify a spatial reference system which has a north pole different than the standard north pole?

I have a geographic spatial reference system (i.e., latitude and longitude) which has a north pole that is not the usual north pole: it's the magnetic north pole at approximately 70.30 degrees north, ...
3
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0answers
314 views

How do I pass a LatLng Bounds from Leaflet to Mapfish Print?

I successfully fired up a MapFish print server on Elastic Beanstalk, and it prints out the sample spec files fine, but I'm trying to pass bounds from my Leaflet frontend now, and encountering a lot of ...
3
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0answers
1k views

Converting projected coordinates to google maps pixels

I have a single polygon in a local projection system. I would like to convert that polygon into an image that can be used as an overlay on google maps. I understand that it may be better to use ...
2
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0answers
40 views

How to install Proj4js.js in my localhost directory?

I'm developing a GIS website for vineyard management. I am using Openlayers with the WMTS IGN (French institute for geography) datas. It works fine. I also would like to add the possibility for the ...
2
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0answers
46 views

Re-projecting WGS84 to OSGB in SAGAGIS

I took some points with a GPS, and I'm trying to convert from GCS to OSGB 1936 British National Grid in SAGAGIS. I'm working with a shapefile. To reproject the vector layer to the OSGB projection I ...
2
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0answers
97 views

How to generate bounding box based on tile numbers using slippy map tiles method?

Description: I am writing a map cache server for my company. I have to get input data based on tms standard and send a request to wms server to render and cache map files. I am using slippy map tiles ...
2
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202 views

Mapping Geocoded addresses onto Census shapefiles in R

I have a list of addresses that I have geocoded to get the corresponding longitude and latitude. > AddressDetail <- geocode(match_address) > coordinates(AddressDetail) <- c("lon", "lat") ...
2
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407 views

How do I solve Gdalwarp error 'too many points failed to transform' for remapping Geostationary to Lambert conformal?

I am trying to remap from Geostationary to Lambert conformal using gdalwarp. My input data is in netcdf, and is in geographic coordinates (degrees) and I would like to output the remapped data to ...
2
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0answers
274 views

Geoserver - empty native SRS field

I'm converting layers from shape files to postgis with the below command: shp2pgsql -s 22175 -c -W "latin1" path/file.dbf' table_name db_name | psql -d db_name Next, I add this layer to the ...
2
votes
0answers
678 views

Projecting point in Leaflet from EPSG 900913 (same as 3857) to EPSG 2232 with proj4js returning unexpected results

I have a leaflet map from which I want to be able to query an api that accepts x y values in EPSG 2232 as inputs. Leaflet doesn't handle point transformations like Open Layers does so I am trying to ...
2
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0answers
93 views

Proj4s.js Library Transformation Accuracy Documentation

I am using proj4s.js for transforming between coordinate systems for a GIS web application. Is there any documentation out there on transformations accuracy provided by the library?
2
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418 views

Help converting projection/coordinates to Google Earth

I'm trying to program a GPS style tracker for a simulation game but I'm having a hard time figuring out how to transform the game's coordinates into Google Earth's. The game's world is flat and has ...
2
votes
0answers
200 views

Coordinate systems conversion

I have the following task. This is my sample data. WGS84 datum (longitude/latitude): -123.75 36.59788913307022 -118.125 40.97989806962013 Spherical Mercator (meters): -13775786.985667605 ...
2
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0answers
686 views

OSGB36 to WGS84 reprojection 'error'

First off, I am a recent convert to QGIS and am greatly impressed with its ease of use and speed compared with the ESRI products with which I am more familiar - my congratulations and thanks to its ...
2
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0answers
442 views

How to overlay geographic data from multiple sources?

Being a newbie to GIS, I am trying to create a map using shapefiles and addresses found online, as an exercise. The steps are below: I downloaded a shapefile of Connecticut from the following link ...
2
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0answers
554 views

OpenLayers WMS overlay tile projection

We are using OpenLayers for our GIS Application and we have base files from Ordinance Survey for UK maps. For creating WMS layers, we are generating tiles of 256 x 256 through Sharpmap Library but ...
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33 views

Why can't I reproject from HARN State Plane Ft Intl to State Plane Ft?

I'm attempting to reproject a feature class that is: NAD_1983_HARN_StatePlane_Oregon_North_FIPS_3601_Feet_Intl to our standard, which is: NAD_1983_StatePlane_Oregon_North_FIPS_3601_Feet When I ...
1
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0answers
23 views

Geodjango transform introduces large errors

Apologies for the possibly naive question. I'm trying to understand how Geodjango (running on PostGIS) deals with coordinate transformations, and am experiencing some unusual behaviour. Let's say I ...
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0answers
45 views

Creating custom projections with Proj4

I'm reading into how to customise projections with Proj4 - specifically to achieve tilted projections such as the example below (from vis4.net) The Proj4 literature is pretty heavy going and having ...
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0answers
50 views

Gauss-Krueger coordinates in Openlayers

I want to show the coordinates of my map in gauss-kr├╝ger coordinates, but nothing works. I tried another projection, displayProjection, lonLat.transform but the answers are the same. my source ...
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0answers
77 views

Am I correctly projecting a geometry using a WKID in ArcObjects?

I would like to take in any valid WKID for a spatial reference and then project a single geometry to it. The following code seems to be working, but (1.) can someone verify that this is the correct ...
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0answers
87 views

How to convert MODIS (Vegetation Continuous Fields - MOD44B) to (.img and hdr) in ENVI

Please can anyone help me to convert MODIS (Vegetation Continuous Fields) to (.img and hdr) formats? In ENVI, anytime i try using the MODIS conversion toolkit, a dialog box appears telling me to ...
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0answers
37 views

Create oblique projection?

bit of an odd one which isn't necessarily package-specific. I'm trying to make a tshirt with a map section centred on the plane between San Francisco, USA, to Galway, Ireland. The Great Circle line ...
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208 views

Reprojecting GeoTIFFs to WGS84/UTM

I'm using libgeotiff and proj4 to read and (try to!) process GeoTIFFs. After reading the file, I want to get the corner coordinates in WGS84/UTM - but there are so many functions and parameters to try ...
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0answers
108 views

Trying to convert to EPSG:27700 (Ordnance Survey) projection, unable to do so

I'm trying to code an interface that allows a user to draw a vector shape on openstreetmap, which is then converted to a WKT string, processed by the server and sent of as a WFS query to emapsite ...
1
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0answers
77 views

MGRS square identifier to polygon

I'm looking for a function/formula/library that basically takes a MGRS square identifier such as 4QFJ16 and returns me the coordinates of the 4 corners of this polygon in some simple form such as ...
1
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0answers
423 views

GPS Coordinates to WKID 102100

I'm currently creating a project for ios and I'm using the latest ArcGIS IOS api. I have a mapView that is using the spatial reference skid 102100 and i am receiving lat long coordinates from an ...
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0answers
68 views

Projection for Tracking a Vehicle

I'm looking for the best coordinate system projection to use for cartesian calculations while a vehicle is running from its starting location to about 100 miles from that spot. The offline format ...
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0answers
231 views

Conversion between WGS84 height and local height datum

For x/y or lat/lon or heights between different ellipsoid, we can do conversion by using proj.4. But I found that if I want to convert between WGS84 height and local height, I found that it is not so ...
1
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0answers
120 views

Converting altitude in feet to pixels on a mercator map image

I know the question might seem farfetched given that the map is 2d. But I essentially want to project items-aircraft-above the map and I would like their altitude to be vaguely 'realistic' in terms of ...
1
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0answers
97 views

How to reproject aqua modis images / ocean color?

I am working with aqua modis, ocean color, L2 - SST image but in order to do I must reproject it. I use the gdal_translate to convert the format of the image but reprojection is becoming very ...
1
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0answers
76 views

resampling errors

I have to reproject my images, but it contains some resampling errors. Any one has any idea on significance of resampling error. Are they neglectable? Is there any good documentation to refer to? I'll ...
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0answers
316 views

Possible to do a datum shift using dotSpatial?

I was hoping to be able to use Reproject.ReprojectPoints to achieve a datum shift between lat/lon values in NAD27 and NAD83. I'm able to correctly reproject from NAD27 lat/lon to NAD27 UTM and from ...
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0answers
173 views

On the usage of Proj4Js->tmerc.js

I am using "proj4js & open layers" for my mapping. I got projection & datum (which is based on "Transverse Mercator") of a local plane and this plane is part of a grid which returns ...
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0answers
318 views

Conversion From Transverse Mercator To Longitude & Lattitude

I have to transform (7-parameters datum transformation) coordinates from northings & eastings to lattitude & longitude. Following are details of source coordinate system(i.e. northings & ...
1
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0answers
292 views

ogr2ogr failed to reproject shapefile error exceeds limits

I cannot get correct transformation from WGS84 to the Hungarian EOV EPSG:23700 (Hungarian Datum 72) using ogr2ogr. I am using ogr2ogr from the fwtools shell. I have a shapefile in GCS WGS84 (epsg ...
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0answers
298 views

How do I use Proj4js or other technique to make custom map projections with google.maps.Projection?

I'm using Google's Projection class to try to convert my map projection from the default spherical mercator to something like Lambert Conformal Conic. I was previously adapting the code from this ...
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0answers
593 views

Converting Lon Lat to UTM Zone 32N in C# with SQLSpatialTools

I have a set of coordinates; Lon 9.42221521, Lat 56.44978001 and I want to convert them to UTM Zone 32N coordinates. I found the SQLSpatialTools library to do the conversion but I need some help. When ...
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0answers
147 views

Proj4js can't handle 90/180degree transformations from 4326

So if you try to do a transform like this Proj4js.transform( new Proj4js.Proj( 'EPSG:4326' ), new Proj4js.Proj( 'EPSG:3857' ), new Proj4js.Point( -180, -90 ) ...
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12 views

Misalignement of the Corine data set after reprojection with gdalwarp, nodata not working either

I want to reproject the original corine data set with a resolution of 100x100m. I am using gdalwarp: $ gdalwarp -overwrite -s_srs EPSG:3035 -t_srs EPSG:32632 -tr 100 100 -tap -wo "SAMPLE_GRID=YES" ...
0
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0answers
71 views

distance difference in Google Earth with exported GPX or KML compared to source shapefile

I've converted a shapefile (points) to KML with QGIS. Points in the shapefile are within 100m distance from each other. When I measure it in Google Earth, the distance changes to 80m. The same ...
0
votes
0answers
30 views

Conversion problem of projection of MODIS LAI from sinusoidal to geographic

I am trying to change MODIS data's (LAI) sinusoidal projection to geographic. Actually I did it. But when I reproject it by ERDAS, the output LAI raster moved about 10 km to west side of actual shape ...
0
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0answers
22 views

Changing original source projection

I am attempting to match up 2 raster layers, both a OS survey map and some independent survey data. The map I know to be in the correct position, However the survey data shows a layer extent of (layer ...
0
votes
0answers
13 views

DD83 to State Plane conversion

I am having an elementary issue with a conversion I have completed successfully in the past in ArcMap10. I am trying to convert DD83 to State Plane 83 using Data Management Tools > Feature > Project. ...
0
votes
0answers
135 views

Point Layer WMS GetFeatureInfo failing when zoom in

I have a problem that i think is related with the interaction between OpenLayers and my Google map Base Layer (inconsistencies with coordinates systems, or something like that). Maybe also this could ...
0
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0answers
23 views

ArcGIS10.1 raster calc introducing unpredictable shifts

I'm reprojecting a DEM to the MODIS SIN grid, and find horizontal shifts in the output. I'm using raster calculator with just the DEM as input and environmental variables to specify output coord ...