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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Overlay polygons on raster in different projections

I'm overlaying polygons on a raster to get the average value inside the polygon (using SAGA->Shapes-Grid->Add grid values to shapes in the QGIS Processing Toolbox), using a geographic and a ...
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37 views

Project Raster Data Loss - 2 Billion People

I am using the SEDAC/CIESIN raster data for population counts. This data is in WGS1984, and I want to project this data to a Fuller projection. After running through "Project Raster" in ArcMap 10.1, ...
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25 views

Projection issue in gwp-openlayers

We are trying to display wms laying that uses EPSP 4326 using gwt-openlayers. Here is a sample of its url: ...
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1answer
88 views

Different projections in the same shapefile

I was just wondering if it was possible to change the projection of only certain objects in a shapefile, while the others remain the same. I have to insert points onto a map, and some of them are in a ...
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2answers
127 views

How to load projection along with raster in R?

Why the operation myraster = raster("test.asc") does not load the associated projection file test.prj located in the same directory as test.asc? Does raster() need a specific argument? It seems ...
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2answers
79 views

US map shape distorted in QGIS

I am very new to QGIS and mapping. I am trying to load a US state map shapefile in QGIS. But the problem is it does not look like another US state map available on the internet. The upper part looks ...
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41 views

Surface Volume 3D Analyst tools

I'm using Surface Volume tool (ArcGIS 10.3) to calculate volume of air from a valley. I delimited my DEM (clip tool) and choose Below as plane reference with 603 m as height. The DEM is projected in ...
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1answer
192 views

Difference between 2 projections?

I have osm.xml file where projection is defined as follows: Map background-color="grey" srs="&srs900913;" minimum-version="2.0.0"> n settings.xml file projection is also set there as: <!ENTITY ...
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21 views

ArcGIS Layers same coordinates not lining up [duplicate]

I have a large polygon for a borough, and smaller polygons for the local authorities within it (they divide up the borough). When I add the smaller polygon layers, the polygon appears distorted and ...
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0answers
19 views

Changing Area Output - PUMAS

I currently have shapefile of US PUMAS and another feature shape file (call it feature X). I am using arcpy to project both of these files to the following projection coordinate system (using ...
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34 views

Stretching of geometry when rasterizing vector data on Google Maps

I'll start with a quick backstory on what I am trying to achieve. I'm working on an offline Android GIS tool and people are throwing giant datasets at it. It converts these into Google features (V2) ...
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1answer
55 views

How to create buffer around point having projection 4326

I am trying to create buffer (in meters) around point(long lat alt) which is in projection 4326 with below code. But it is not giving expected output. SELECT ...
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1answer
38 views

Generate tiles with stereographic projection

I am developing a web application that shows some information to the user on a map. The application is not connected to the internet, so for the first protoype I generated some map tiles using ...
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2answers
78 views

GDAL - Warping raster to new domain/resolution/projection causes data loss

I am attempting to warp a GTiff from a lat/lon projection to a higher (~2x) resolution Polar Stereographic grid. In the output GTiff any cells north of 64 deg lat become NaN instead of their actual ...
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1answer
43 views

Georeferencing uneven/irregularly gridded rasters

I'm trying to take a set of NetCDFs and turn them into georeferenced datasets using GDAL. However, the only Geospatial data is a set of 2-D lat/lon arrays. The projection type is not lat/lon. THe ...
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1answer
26 views

Geowebcache alias for custom projections

Is there a way to configure a projection alias in geowebcache? E.g. if I would like to advertise projection EPSG:25833 and EPSG:32633 to the client, while requesting tiles from the backend using ...
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1answer
50 views

ArcMap ModelBuilder: problem with %name% variable when used in iteration for projection

I have prepared a model which should project all shape files ( currently in MUTM 81) in a folder to MUTM 84. But when I use “%Name%” in output dataset for geodatabase as “D:\Soil ...
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2answers
6k views

How to create custom coordinate system in ArcGIS Desktop?

I have a series of control points with xy coordinates in both NAD83 UTM and in a local grid. How can I go about creating a new projection file in ArcGIS 10 for the local grid?
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34 views

Projecting NAD83 on-the-fly to WGS84 [duplicate]

I have a point feature class in a geodatabase that uses WGS84 as its SRS. A colleage of mine created points in this feature class using an external database containing lat and long values. However, ...
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10answers
3k views

Discontinuous or Interrupted map projections?

Do any of the current open source GIS softwares support discontinous projection systems? E.g. sinusoidal, dymaxion, butterfly, etc? If not, are there any affordable commercial ones that do (affordable ...
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2answers
98 views

Assigned projection and an unprojected WGS84 geographic coordinate system

I am to be submitting a shapefile for review but the first two requirements have me confused. Are these requirements conflicting or am i just not understanding the question? Requirements: The ...
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0answers
19 views

QGIS - Label polygon with different projections

I have a polygon layer projected in an UTM. In properties I checked 'show all labels for this layer'. Does anyone know why the label does not show until zoom 15:1 in QGIS with CRS-4326, while in ...
3
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1answer
59 views

USA Contiguous Albers Equal Area Conic to miles

My data is in USA Contiguous Albers Equal Area Conic projection. How can I convert the USA Contiguous Albers Equal Area Conic projection to miles?
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1answer
2k views

Computing UTM Zone from lat/long point?

I am trying to convert a latlong point to UTM. To define UTM projection, I need to calculate zone for the point. I am trying to figure out the best way to do this. One way to do this would be ...
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14 views

Reprojecting: Different results in OGR and PROJ.4 for EPSG24373 (India) [duplicate]

I need to convert EPSG4326 lon/lat tuples to EPSG24373 (Kalianpur 1880 / India zone III). However, when using the Python bindings of OGR and PROJ.4 (pyproj), I get different results. I wrote the ...
137
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11answers
38k views
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1answer
61 views

Determining Projection using QGIS?

I am very new to QGIS and I am trying to determine the spatial projection and the units of distance of a certain raster file. The closest thing I can find is the CRS, which is set to some sort of ...
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1answer
915 views

Projecting from State Plane (Oregon) into UTM (zone 10)?

I have an air photo with the following xy coordinate system name: NAD_1983_StatePlane_Oregon_North_FIPS_3601_Feet_Intl and the following in the description field: Projection: ...
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1answer
52 views

How to generate a tiled map from a spherical mercator SVG?

I'm not a GIS person; this is really just a side task, so I probably have terminology/strategy incorrect; I would ask that you please bear with me. I have the following requirements for a Qt-based C++ ...
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1answer
27 views

Projection issues with merging files. [duplicate]

New QGIS user, 2.6 Brighton. My project CRS is default to Nad83ft / N.Carolina (US). I loaded various polygon and line (provided to me) that have various CRS's but they still show correctly in place ...
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0answers
93 views

Why does field calculator compute area in square meters?

I am using EPSG:102748, and have set my Settings/Option preferred measurement units to ft. My CRS is NAD_1983_StatePlane_Washington_North_FIPS_4601_Feet, and when I use the measure tool, it returns ...
14
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5answers
2k views

Does Re-Projecting ShapeFile only update content of *.prj file?

if i wish to change the projection of some shapefiles from .. lets say NAD83 (4269) to WGS84 (4326) ... and by using some 3rd party app .... does this mean the .prj file is only updated .. and not the ...
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2answers
350 views

Reproject TM65 to OSGB in ArcGIS

I have a TIFF file in the TM65 (Transverse Mercator) projection, and want to convert it to the OSGB (British National Grid) projection. I'm trying to do this in ArcGIS using the Project Raster tool. ...
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1answer
76 views

How to retrieve PROJECTION value for a map?

I am trying to read the Projection from Geotiff/shape file, using gdal 1.9.0 by the following command in the command line... gdalinfo.exe -proj4 map-path but its retuning empty string for ...
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82 views

Length difference between Google Earth and ArcGIS for Desktop?

I have drawn a complex path with multiple vertices in Google Earth (GE) Pro and its measurement property is shown as being 2,460 nm. It is located East of Australia. If i import this KML into ArcGIS ...
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42 views

Unknown coordinates in Shapefile, projecting doesn't give expected results

I'm reading a Shape file (four files actually, .dbf, .prj, .shp and .shx) containing polygons representing certain areas in my neighborhood. For this I use C# and a library called DotSpatial. I can ...
2
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1answer
325 views

Converting map to use space oblique mercator projection using ArcGIS for Desktop?

I have a map document in ArcMap which I want to convert to using Space oblique mercator projection, but I am not sure if ArcMap supports it. Any hints on how to achieve this?
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0answers
11 views

Retrieve Extent of Map in specific projection [duplicate]

Geoserver WMS Layer and WFS Layers that I display with OpenLayers. MaxExtent of the map is hard-coded. map = new OpenLayers.Map({ div : "map", projection : 'EPSG:31466', units : "m", ...
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1answer
892 views

Problems with lat long projection

I have a .xls spreadsheet with about 60,000 rows. Most of them have Latitude and Longitude. I simply want to display these as points in Arc10. I've tried making a .dbf in arccatalog and creating a ...
4
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1answer
85 views

Equal area projections with different area results in ArcGIS for Desktop?

Using ArcGIS, I have to calculate areas of huge polygons all over the Pacific Oceans betwwen 20N and 30S. I have been trying different Equal-areas projections (Cylindrical and sinusoidal for example) ...
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0answers
51 views

WGS 84 - NAD 83 with a twist

I have a dataset of GPS field point collected received in WGS 84 but displayed in NAD 83 UTM. I used a field point to inform a total station for a reference starting point, so all my total station ...
2
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1answer
77 views

How to re-project shapefile to be compatible with Openlayers satellite imagery

The goal: Visualize a map using google's satellite (and projection) using my collected points. Right now I have a shapefile of my collected points from surveying. I created it by adding my csv file. ...
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28 views

Resampling methodology when projecting a raster

When projecting an SRTM raster with "Project Raster" tool in ArcGIS10.2, what is the best resampling methodology, bilinear ot cubic convolution?
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1answer
69 views

Combining UTM zones into one solid map

I have an area, example 4000m x 4000m. So, 4x4km. The origin can be placed anywhere, maybe in center, maybe on the top-left, nevermind. Now, I want to fill this area with some stuff from OSM. I read ...
2
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1answer
87 views

Reprojection error

I have a lidar file (file.las) with the following spatial reference: Spatial Reference: PROJCS["NAD83 / UTM zone 11N", GEOGCS["NAD83", DATUM["North_American_Datum_1983", ...
4
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4answers
10k views

Getting shapefile in right projection using ArcGIS Desktop? [duplicate]

I have an older map that I didn't create. I'm just trying to get everything to line up on it, and having a hard time. The data frame is in NAD_1927_UTM_Zone_12N, as are the point shapefiles (derived ...
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1answer
34 views

ArcGIS 10.2.2 Does “Batch Project” work for different input datum?

I have two vector data sets - one is in NAD27 and the other is in WGS84. Normally I reproject one at a time. But can I just use 'batch project' to reproject both of them to NAD83 at once? I was not ...
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3answers
9k views

Using ArcMap, how may I convert a shapefile to use decimal degrees?

I have a shapefile that currently uses meters as the measure for its coordinate system, but the map framework I wish to use expects decimal degrees. I'd like to reproject my shapefile to use decimal ...
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1answer
30 views

How does ArcGIS calculate distance of 2 points in custom projection?

I used a software called WRF to export (lat,lon) and want to draw them in ArcGIS. but in this software, all the coordinates are caculated under this settings: the earth is as a sphere which the radius ...
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0answers
19 views

gdalwarp for warping a Space View Perspective or Orthographic tiff

i need to warp an image with a Space View Perspective or Orthographic project. What is the parameter for the gdalwarp -s_srs "+proj=???? +ellps=WGS84 +datum=WGS84" -t_srs EPSG:4258 in.tiff out.tiff ? ...