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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UTM ED 50 transformation to WGS84

I have a set of navigation shot points (pre 1975) with coordinates that are based on a UTM ED50 zone 33 projection and I need to transform these to WGS84. My procedure has been to load the excel fine ...
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2answers
16 views

MMQGIS:Create:Hub Distance: Output shapefile in wrong coordinate system

I have a QGIS-project that is completely in EPSG:31467 - DHDN / Gauss-Kruger zone 3. It consists of random points (camera traps) surrounded by a polygon (forest edge). I already converted the polygon ...
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3answers
57 views

Plotting Netcdf data. How to get right projection?

Maybe it's very easy for someone to fix, but I'a a new one in R, so I really need help. I/m trying to plot data containing lat, lon and variable (nmf2). The grid isn't a regular one, so there are some ...
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1answer
29 views

Guessing unknown projection of Webapp

I have a series of points around the greater london area (may be also around 100-200kms away from it) like those here in the format Lon, Lat: 43032.1,32681 95816.5,34473.8 15439.3,-13987 The ...
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1answer
17 views

Ogr2ogr trying to import and convert shapefile to EPSG:3857

I'm attempting to import a shapefile (along with .prj file) to MySQL using Ogr2ogr and using the t_srs option set to EPSG:3857 (the default for Leaflet and Google Maps) but I'm getting odd results, ...
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18 views

How to set projection parameters in ArcGIS?

I would like to open .hdf satellite data(FY-3 from China) in ArcGIS, but there is unknown projection info in it. The extent of hdf is : top: 0 right:1383 bottom:-586 left:0 And the projection ...
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21 views

Polygon Shifting in WGS 84

I'm troubleshooting some discrepancies between intersection results in State Plane and WGS 84. The intersect was ran when both the polygons and points were same PCS ...
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1answer
29 views

How do I interpret this proj4string and why doesn't changing units change its resuls?

I'm new to GIS - I have a background in statistics. I have the following proj4string: '+proj=lcc +lat_1=40.66666666666666 +lat_2=41.03333333333333 +lat_0=40.16666666666666 +lon_0=-74 +x_0=300000 ...
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1answer
39 views

Determine projection of a shapefile

Is there anyway to determine projection of a shape file which doesn't have .prj file? I am trying to re-project this shape file to another projection, I know that it is Lat long data. I could manage ...
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1answer
49 views

How to add a lat/lon grid to a map using azimuthal projection?

I have a north azimuthal projection, equal areas. I want to create a map from it (in QGIS) and display a grid on it for better orientation. Thats how it looks like: Why doe my degrees have so ...
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1answer
60 views

World map different projection

I want to display something on a world map. I have these shapefiles http://thematicmapping.org/downloads/world_borders.php I want my map to look something like this: or I am using QGis. Is ...
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36 views

Which projection should be chosen to model transmission lines across the USA?

I am looking at different options for high voltage power lines in the US. These power lines cross several states. Since in the end the distance is of importance, is the USA Contiguous Equidistant ...
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20 views

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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1answer
107 views

QGIS: How to add a second polygon that is exactly 5km larger in all directions?

Given is a map with an airport. Within a distance of 5km around the runway there is a so called no fly zone for drones (in Switzerland). I want to show this zone in a map. What I would like to do is ...
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34 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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22 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
85 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
57 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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584 views

Appropriate map projection for the Pacific Ocean

I've found this map that shows the Pacific Ocean from http://www.transpacificproject.com: I'd like to produce a similar map, for the same region of the earth and I'd like to use the same projection ...
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29 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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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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2answers
81 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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25 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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17 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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1answer
39 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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31 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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1answer
33 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
39 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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1answer
20 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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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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2answers
77 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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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 ...
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1answer
41 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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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 ...
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1answer
56 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
36 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
72 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 ...
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35 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 ...
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2answers
61 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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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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65 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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1answer
64 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
39 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
69 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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27 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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49 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 ...
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1answer
29 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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1answer
79 views

How can I project geojson borders on the google earth tiles in leaflet?

I started working with leaflet and google earth tiles. I want to add borders on my map so I tried to use the countries geoJson Data as a layer on the map. The problem is that the json borders ...
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1answer
27 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 ...