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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How to make two layers with different CRS line up correctly?

I have an Excel Table with Lat/Long information. Its lat/long of this coordinate System: UTM zone 29n My population density map instead is this coordinate system: UTM WGS84 Example: Barcleyville: ...
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471 views

Open Layers 3, GeoJson EPSG:4326

I have two layers: 1) var layer = new ol.layer.Tile({source: new ol.source.OSM()}); 2) var layer_g=new ol.layer.Vector({ projection : 'EPSG:4326', style: new ol.style.Style( { ...
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0answers
150 views

Transforming zonal and meridional velocity from regular lat lon to rotated lat lon?

Like in Transforming regular lat/lon to rotated lat/lon? that was asked before, I am working with climate data and I need to transform zonal and meridional velocities (u and v) from regular lat lon ...
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1answer
411 views

stack rasters with different extent and resolution in a loop with R package raster

I would like to stack rasters with the R package "raster". Layers are in ascii format. I want to crop them to have the same extent and project them to have the same resolution. My code gives raster ...
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2answers
83 views

What kind of projection is this?

Can someone tell me what the projection is in this zone map from NOAA? I am trying to replicate it (or get close) in QGIS.
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0answers
45 views

Creating equirectangular projection from 3d spatial model?

Apologies if this is not the right group for this question, but I think there may be people here who can help. (I'm open to suggestions for better places to ask.) I have a program that contains a ...
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14 views

MapInfo2leafletjs tool

I've downloaded a tool to export a table from MapInfo GIS to leafletjs. The base map from Openstreetmap has been created, but the choropleth map of regions is not being displayed. One possible ...
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0answers
45 views

Correctness of Measurement

I tried Google, but the questions isn't that easy to put in Google, so I haven't found anything about this. I am making a database with different locations (latitude and longitude). For this I have ...
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3answers
399 views

Displaying X, Y coordinates on ArcGIS not working

I am trying to geocode some coordinates I have from my Excel sheet onto ArcGIS but everytime I do so, it doesn't show up on the screen. When I right click on the sheet layer to see where it went, it ...
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0answers
45 views

How can I move a polygon to a different place on the globe, while maintaining its true geographical size? (QGIS)

I'm trying to do something similar to the Greenland vs Africa comparison -- superimpose one country over another, showing how their true sizes compare (the example on the right). Thought this would ...
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0answers
77 views

Changing projection on each page of data driven pages

I am working with data driven pages and a raster image of the world. I have a separate polygon shapefile of all of the UTM zones (with a polygon for zones 1-60, north and south, for a total of 120 ...
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80 views

Defining Projection Lambert Conformal Conical w custom GCS

I have a shape file from Mexico´s INEGI site that doesn´t have prj file. I am having trouble defining the projection in Arc. INEGI tells me it is projected as Lambert Conformal Conical with a ITRF92 ...
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0answers
28 views

Measuring large distances when all layers are in decimal degrees using QGIS?

I just developed a distance matrix between various points across Canada in QGIS. The distances produced are in decimal degrees, and I would like to view them in metric. I am unsure how to do this.
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0answers
96 views

gdalwarp UTM Zone 1 to WGS84 - fails to transform

I have a global dataset consisting of tiles in UTM projection that I want to mosaic and therefore need to reproject to a common projection. Can I solve my reprojection error with options to gdalwarp ...
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0answers
23 views

What is the right projection for area calculation in Kenya? [duplicate]

I want to calculate the area of counties (1st admin level) in Kenya in ArcGIS. What is the right projection for that? I know I should use an equal area projection, but when I use them (I tried six ...
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2answers
49 views

Geoprocessing results outside of defined extent [closed]

I am running ArcGIS 10.2 Desktop Several different models I have built and tested successfully previously are demonstrating the same problem. They appear to execute slightly to the South of the ...
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1answer
582 views

OpenLayers 3 display wfs EPSG:4326 on EPSG:3857 map

Is it possible in OpenLayers 3 to project an EPSG:4326 wfs vector layer on to say a MapQuest EPSG:3857 map? I've tried the following code (modifying this example Open Layers 3 wfs example, but the ...
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1answer
427 views

Openlayers3 using custom EPSG:25832

I want to use EPSG:25832 as the default projection for all my layers. The projection is not working correctly because the Position (center point) should be in Germany but I end up in France. When I ...
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2answers
245 views

Ukrainian topographic map: projection and coordinates?

I need some help. I managed to get Ukrainian topographic maps for my project. I'd like to do the georeferencing in QGIS. The problem is that I don't have a clue what projection was used and how to ...
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0answers
86 views

How to align with QGIS two layers that have the same projection?

I am using QGIS 2.12.0 to create forest maps. I usually succeed to create maps from shapefiles with different projections but for some reason I cannot succeed to align the layer of one shapefile. As ...
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0answers
52 views

Do locations “move” when shifting datum?

I hope that this is the right Stack Exchange for this question. I may be oversimplifying this, but I'm looking for verification in my understanding of the following: If I have a spatial dataset in 2 ...
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1answer
35 views

Converting entire map to UTM 18 if only interested in part that is in UTM 18?

I am using some polygons and rasters whose initial extents cover all of Canada or all of North America. I am interested in a small area in Ontario that is in UTM zone 18. I would like to use the UTM ...
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194 views

ArcGIS project WGS_1984_UTM_Zone_32N to GCS_WGS_1984

I'm new to GIS. I have a shapefile for which I defined the coordinate system (using the Define Projection tool) to WGS_1984_UTM_Zone_32N and now I'm trying to reproject the shapefile from ...
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0answers
130 views

Geoserver Mercator to EPSG:4326

I have external WMS server, which have a layer pusblished in Mercator projection (EPSG:3395). I have this layer set up in Geoserver (2.8.1, GeoTools 14.1). I need to expose this layer via WMTS in ...
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50 views

how to fix projection in QGIS from earth data

After downloading and opening natural earth data in QGIS, the result shows like this I have tried uncheck simplify geometry but it doesn’t work. I think the problem is related with globe ...
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2answers
86 views

Converting X and Y to lat/long using UTM WGS-1984 48N projection system

Hi I am using street directory api and it is using the UTM WGS-1984 48N projection system. I only need to convert static values! I am mostly using JavaScript but at the moment I'm alright with any ...
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0answers
13 views

StreetDirectory API: metricToGeo returns undefined

I am currently implementing the SD API and am trying to convert their x and y coordinates into lat and long. I only need the static values and this is how I implement it: <script type="text/...
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16 views

WMS Service Return plate carree

I am very new to the space and was hoping someone might be able to help point me to a WMS server that will return a plate carree projection and not web mercator projection.
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28 views

Raster statistics change after re-projection — which one is correct

I'm looking into some global DEMs (like ETOPO1 - http://www.ngdc.noaa.gov/mgg/global/global.html), and noticed that the statistics for the elevation values can change quite a bit after reprojecting ...
3
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2answers
143 views

Projection for Calculating Distances in Continental United States?

TL;DR Question: I want to calculate distance from point to edge of nearest polygon for 2,000 points in Continental United States. What is the best projection to use? Full Question: I have two ...
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0answers
21 views

Layer is too small compared to rest of map? [duplicate]

I do apologize I am very new when it comes to this, this is my first GIS class. So I have one layer like this And I am trying to add another layer, but it is extremely small and placed in the ...
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55 views

Avoiding 400km shift NW in *.dgn files are shifted 400km (N/W) in *.dgn files with QGIS and Ubuntu?

I received .dgn files with VN2000 projection. You can find the files here. I can open them with QGIS easily by using the Browser Panel. The dataset includes lines, polygons and point. I am being ...
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0answers
31 views

Openlayers GeoJSON write not maintaining projections

How do I get GeoJSON.write to maintain the projections used in the construction of the GeoJSON? points.geojson {   "type": "FeatureCollection",   "features": [     {       "type": "Feature",       "...
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1answer
47 views

How to calculate areas for data that covers the whole of Australia [duplicate]

I have a polygon shapefile showing mining areas across all of Australia. I want to calculate the area for each of the polygons however they have been provided in a Geographic Coordinate System (GDA_94)...
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2answers
80 views

What data projection should I use for area analyses in different countries at a global scale

I'm creating A4 maps to show where forest cover and mining fields overlap across the globe. Each A4 map focuses on a specific country (e.g. India, USA, China, Australia...). For each country, I need ...
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0answers
58 views

QGIS Server & custom CRS

I'm using QGIS Server and an OpenLayers-based web client (in EPSG:3857). I have a QGIS project that I want to serve with QGIS Server, containing layers in several CRS, including custom ones. ...
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0answers
22 views

Geoserver import does not recognize projection

Using GeoServer 2.8 and the Data importer plugin I can import shapefiles generated in ArcMap with WGS84 geographic coordinates (EPSG:4326) and UTM+WGS84 projection (epsg:32724). As a reminder, ArcMAP ...
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1answer
85 views

How do I fix distortions when reprojecting cshapes world maps?

I am using the cshapes package in R as a source of historically accurate country borders. While the default WGS 84 maps plot fine, I would like to reproject the maps. This introduces some distortions ...
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124 views

How to test polar stereographic projection for a specific longitude intersection?

I'm writing a library that tests grids defined by map projections for intersections, and am running into an issue implementing the test for polar stereographic and rectangular projections - '...
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1answer
39 views

Reprojecting Tifs [duplicate]

When I import some geotifs into QGIS, they use a reference of 0, 360. My basemaps are all -180, 180. Both the basemaps and geotifs use the same CRS, WGS84. So the geotifs display starting at 0 on the ...
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2answers
569 views

Add scaleline control to openlayers 3 map with unknown projection

I've a mapguide map display with openlayers 3 like this: var options = { "minZoom": 0, "maxZoom": 100, "center": [mapInfos.center.x, mapInfos.center.y], "extent": [mapInfos.extent.minX, mapInfos....
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1answer
245 views

Why do pyproj and matplotlib basemap produce different results when they convert my lat-long data into a CRS?

pyproj and matplotlib basemap seem to produce differing x-y values when they convert my lat-long data into the same CRS (such as Albers Equal Area). These x-y values tend to be off by hundreds of ...
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0answers
37 views

Is it safe to query for points contained within polygons using a lat-long projection?

I'm querying for points contained within a polygon. All data - both points and polygons - is stored in latitudes and longitudes. Technically I should probably project this data to a suitable local ...
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0answers
25 views

Should I set the projection if the data has already been projected?

I need to plot some data which was produced on a native grid with a lambert conformal conic projection. I need to create a geotiff (using python and gdal) and was wondering how to go about and do ...
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0answers
27 views

change projection for openlayers map with kml file

I use the basic example shown in dev.openlayers.org/examples/sundials.html to display kml files areas, with map.zoomToExtent(kmllayer.getDataExtent()) to auto center and zoom. The problem is that ...
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0answers
199 views

how to set the geotransform using GDAL in python

I am trying to create an image from a numpy array and georefenrece it so that I can import it into qgis. I have the latitude and longitude in degrees for the top left corner of the array as well as ...
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0answers
59 views

problem with area calculation in QGIS [closed]

I encountered a problem in QGIS 2.10.1 when I tried to calculate the areas of polygons in a polygon layer. I followed the instructions here (http://manual.linfiniti.com/en/vector_analysis/...
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0answers
39 views

How to create raster with origin in degrees and dx dy in metres

I need to create a raster from array. In gdal if i understand correctly i need to specify the top left lat lon for the SetGeoTransform((originX, pixelWidth, 0, originY, 0, pixelHeight)) however the ...
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0answers
39 views

Projected Coordinate System issue using GDAL and qgis when defining x and y

I have a numpy array which I would like to save as GeoTiff using GDAL in python. The array was created using the following PCS in mind: +proj=lcc +lat_1=48 +lat_2=48 +lat_0=48 +lon_0=0 +x_0=0 +...
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1answer
35 views

Get pixel geo info according projection and map extent

I would like to know if it is possible to calculate the geographic coordinates (lat, lon) for a pixel specified by its x/y (top-left) cartesian coordinates in a map image/raster? The datum and ...