Tagged Questions

A map projection is any method of representing the surface of a sphere or other three-dimensional body on a plane

learn more… | top users | synonyms (1)

2
votes
2answers
146 views

Wrong projection high quality shapefile for the coastline of Helsinki region (Finland)

I did some spatial interpolations in R and I need a support for those. Looking for shapefiles online the best I could find was and it looks really horrible, the same area in ggplot looks like . I ...
1
vote
2answers
87 views

OpenStreetMap Tile Server with Custom Projection Systems

I am trying to install the OSM tile server on a local machine with a custom projection system like epsg:3573. For the server installation I followed this tutorial ...
0
votes
1answer
64 views

Coordinate System Alignment

I have four shapefiles with different original projections that I am trying to bring into ArcMap 10.2. How do I set these four shapefiles to a single projection that will display the layers correctly? ...
0
votes
2answers
55 views

How to set a coordinate transformation GRID

Does anyone know how to set a coordinate transformation in qgis so I can measure the distances in meters or kilometers? If anyone has a clue, would be just great. Thanks!
0
votes
1answer
130 views

WFS request with CQL_Filter projection

I have a layer in Geoserver called bln_blocks. The layer is in EPSG:3857. I am doing the follwoing WFS request with a CQL Filter: var geoserverURL = geoserverURL + '/ows?'; var service = ...
0
votes
1answer
165 views

Show map using esri leaflet, with 4326 spatial reference

I have this MapServer http://geoservices.big.go.id/arcgis/rest/services/RBI/Rupabumi/MapServer It turns out it uses 4326 spatial reference. I want to present it using leaflet, my code so far: ...
0
votes
1answer
124 views

How to calculate point from lat/long, angle, and distance? [duplicate]

I am trying to calculate the point from a given lat/long, a bearing, and a distance. This is for plotting weather given a aeronautical way point. For example: Given a waypoint with a known ...
0
votes
1answer
64 views

problem in scale of projected raster

I have a shapefile (my basin limit) and one raster file that I projected it to the shapefile coordinate system and set its cell size to 1000m(area=1Km2). my basin area is 5400 Km2 and it should ...
0
votes
0answers
46 views

projections Basemap and pyproj

I am struggling to understand the projections using pyproj. for now my question is to understand the results of projection operations I have following coordinates that I project on x,y lon = ...
1
vote
1answer
34 views

Can I edit coordinates within an edit session and reproject without reloading the data

I have one lat/long to correct. I edited within my table, saved edits, and now when I project using the Project tool the point stays on my map in the same position. Do I need to reload my data from ...
2
votes
1answer
26 views

Applying distance/area dependent procedures in geographic coordinates over large areas?

I'm currently doing some niche modelling with data in geographic coordinates spanning all of Latin America. I am using R for my analysis. Some of the tasks I have to perform are area/distance ...
2
votes
1answer
26 views

Classic United Kingdom Projection?

When you visit a classroom in the United States and see a map of the contiguous states on the wall, it's usually in NAD83 Albers Equal Area with the central meridian right at 96 West. Is there an ...
1
vote
1answer
36 views

Project one layer in qgis using projection CRS of another layer

I am using QGIS 1.6 and have imported a set of latitude, longitude points from a csv file as a layer. I also have another layer from a shape file. When I go to layer->properties for the second layer I ...
0
votes
0answers
31 views

cs2cs works one way but not the other

I am trying to build a short program using cs2cs that will work on any windows pc I copied cs2cs.exe and proj.dll to a seperate folder When i run this to convert israel tranverse mercator to decimal ...
0
votes
0answers
56 views

gdal read whole geotif band into vector

i have another c++ GDAL question. I try to read alle elevation data out of an GeoTiff file into a c++ vector so that i can get elevation at x,y like this: vector[x][y]. I also like to use this data to ...
0
votes
0answers
32 views

Mapnik projection for rectangular coordinates

I am trying to use mapnik to render indoor floorplans and am having a little trouble figuring out the SRS projection. I have geoJSON that represents the floorplan. The coordinates are just cartesian ...
0
votes
0answers
41 views

50m x 50m grid around the world

I'd like to subdivide the earth into a grid of approx. 50 x 50 m cells (big database, I know). To make it more complicated (and fun), I also need to be able to determine to which cell a given set of ...
0
votes
3answers
76 views

Defining custom projection using baseline survey coordinates

I have CAD data that I need to incorporate into a GIS analysis. The CAD data does not have a defined projection, but the drawings include a table of survey baseline points. I need to know if I can ...
1
vote
2answers
335 views

Changing layer extent to decimal degrees?

Using ArcMap or ArcGIS 10 ... In the photo below, you can see my extent is in meters while my projected coordinate system is in decimal degrees. How can I convert my layer extent to decimal degrees? ...
3
votes
1answer
150 views

Is there any Google Maps-like zoomable world map, but with an equal-area projection?

Whenever I look at Google Maps at a global or polar area, the projection hurts. Is there any web service with a zoomable world map, that uses an equal-area projection — preferably pseudorectangular ...
3
votes
1answer
40 views

Why are Google Mercator and UTM rotated towards each other?

Being a self-taught GIS user, I struggled a while before getting the grips on map projections. But now this: because I like to use OpenStreetMap as a background layer for orientation, I have saved my ...
1
vote
1answer
57 views

How to find Latitudes and Longitudes of projections of the vertices of a rectangular plane below earth's surface? [closed]

I want to find out the latitudes and longitudes of projections of the vertices of a rectangular plane inside the earth's surface. I know dimensions of rectangle, angles of orientation and latitude and ...
2
votes
2answers
107 views

which map projection should be used for global map with geography and human demographics

I am working on a project to try to identify the most threatened populations (on a global scale) of having a limited access to freshwater. I want to compare those most at risk currently and then add ...
1
vote
2answers
104 views

Adding a custom projection to the epsg.properties

I have created an entry at www.spatialreference.org of a customized .prj file. http://www.spatialreference.org/ref/sr-org/7973/ I'm trying to add the generated geoserver entry to the EPSG.Properties ...
0
votes
1answer
477 views

How to use Google Maps projection with GeoDjango/PostGIS

I am building a web service with GeoDjango which involves user submitted events including a location. I created a model field for my location using django.contrib.gis.db: location = ...
1
vote
1answer
141 views

OpenLayers Plugin with on-thy-fly-transformation causes wrong coordinates

I am using the OpenLayers Plugin with the maps from Google Satellite. In Qgis I have chosen on-the-fly-transformation into WGS 84. But the WGS 84 coordinates in Qgis are now 0.15 degrees further E ...
0
votes
1answer
76 views

Copy .prj file into QGIS projection folder

I want a custom projection used in ArcGIS be available in QGIS. I have the .prj file copied out of a ArcGIS folder (containing different projections). Now, I want this file to be added into QGIS. Is ...
0
votes
0answers
73 views

km measurement in qgis with EPSG 4326

I'm struggling with a small issue. I'm working with the master version of QGIS and I have some layers loaded in my project. All the layer are in 4326 projection and the on the fly option in NOT ...
1
vote
0answers
36 views

Problem with projection in meters with ArcGIS 10.1 [duplicate]

I hope you can help with the following problem. I have a shapefile and want to project it using a projected coordinate system with meters as unit. What I did was to change the projection from ...
1
vote
0answers
37 views

Get XY in different projection without changing data frame using python addin [duplicate]

I been searching for a way to use this http://forums.arcgis.com/threads/49273-getting-xy-from-mouse-click-using-python tool but print the XY in different coordinate system like WGS 1984 (decimal ...
1
vote
0answers
105 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 ...
0
votes
1answer
221 views

Using Fiona to write a new shapefile from scratch

I am new to Fiona, and trying to wrap my head around reading a csv file and writing out an ESRI shapefile. I have most of it down, but am missing two things; (1) defining the projection/spatial ...
0
votes
0answers
47 views

Assign a particular projection for un-projected raster/vector files in a folder/sub-folders

We are having 1000's of raster images/vector (shp,tab,dxf) files in a folder/sub folders. Is it possible to check the projection of those and if it is an un-projected one? WGS 1984 has to be ...
0
votes
1answer
36 views

Political world map texture?

What is correct name of texture and/or projection, which is suitable for 3D engines? I want to apply world map to 3D sphere, but a variety of images found by Google makes me thinks that some of them ...
0
votes
0answers
56 views

Cause of MODIS Reprojection Tool errors?

I have installed the MODIS Reprojection Tool (mrt) and it says the installation completed successfully but it does not mosaic my images properly. However, there seems to be some projection errors. ...
1
vote
1answer
66 views

List the projection & datum of all the files in a folder

In QGIS/GRASS, is it possible to list the projection details of all the shp,tab,dxf files in a folder ? We are having 100 - 150 files in too many folders. We would like to create a table of Proj ...
0
votes
0answers
21 views

calculation precision during projection transformation

I am using wgs 84 base tiles, and the tile is not rendered as image but with geojson format. I try to draw them in the tile according to the data. And the geometry of the returned feature is lng and ...
1
vote
1answer
172 views

Openlayer plugin in QGIS, error in projection 3857 Pseudomercator

I'm using QGIS plugin Openlayer to set the background of Google satellite under my vector layer. However, even if I project my layers as EPSG 3857 (the default and only possible projection for ...
1
vote
1answer
109 views

How to project vector data in QGIS 2.2?

I'm running QGIS 2.2 on Ubuntu 14.04. Trying to project data gives me a hard time right now. The last time I did that was in 2.0 and I basically changed the projection by saving the data as a new ...
1
vote
1answer
57 views

QGIS Digitizing in Cartesian

I have a client, that needs some geological maps digitized (polygons) in a Cartesian grid. It would be a basic, square grid with North up, and coordinates in x and y. Some of the maps will need to ...
0
votes
0answers
90 views

leaflet.js ImageOverlay projection bug

We are trying to display a image over the leaflet map using "ImageOverlay" layer, but it does not work according to expected. In Google Maps works perfectly. Apparently Leaflet just stretches the ...
1
vote
1answer
100 views

Importing a DEM in ASCII format into Arcmap - Projection issues [closed]

I've been trying for the last couple of days to import an ascii grid file into Arcmap. However, I'm really battling to project the data. Can anyone please assist? It would be very much appreciated. ...
1
vote
0answers
108 views

Calculating closest distances in meters/kilometers given lat/long coordinates?

I am using ArcGIS 10.2 for Desktop. I have a shape file containing points worldwide with lat and long, and another world map polygon file whose Geographic Coordinate System is GCS_WGS_1984 and Datum ...
2
votes
1answer
54 views

Valid values of mollweide projection in QGis

i just imported a vectorlayer (without any reference points) to qgis as mollweide projection to save it to longlat. What i am wondering about is a mathematical problem: Not every x,y coordinate on the ...
0
votes
0answers
41 views

Raster projection problems

How would I go about specifying the following projection in Arc and QGIS? After defining this, how would I then go about changing the spatial reference to ESPG 27700? The following are the details of ...
2
votes
1answer
36 views

Hölzel projection - prj.file

Is there a prj-file-defintion available for the Hölzel-projection? (http://dl.maptools.org/dl/libproj4/manual.pdf#page=58, page 58)?
1
vote
2answers
156 views

How to fix shape file projections

I have a project with several shape files. The files overlapping however. I have to go to unusable extents to even see the file on the same screen. I have tried using to project to as suggested here ...
1
vote
1answer
117 views

Why doesn't LeafletJS complete the conversion when re-projecting to Spherical Mercator?

When I use the Mapbox Leaflet pre-packaged Projection class SphericalMercator to project a lat/long coordinate into EPSG:3857 I have to multiply the result Leaflet provides by the earth's radius. ...
8
votes
2answers
389 views

How to get a “classical” globe projection

I have a shapefile of the world continents in EPSG 4326. To what reference system do I have to reproject my file to get a projecting like this globe below?
2
votes
1answer
64 views

Bad calculations with Colombian projection (EPSG:3116)

Solved, reading mail-archive I can understand that there is a conflict between: gt-epsg-wkt-9.2.jar gt-epsg-hsql-9.2.jar I tested removing each one, with 'hsql' I get the same wrong result, but ...