| Map Projection Viewer | [x] |
This application allows to create a map for most projections defined in the PROJ4 epsg file (version 4.8.0).
The dropdown lists (lonlat to utm) are ordered by the projection short name and bold names are projections supported by proj4js.
After a selection the button will be enabled and on click the map will be drawn with the selected projection.
The first two categories - 700 and 800 - are default definitions for all known projections of PROJ4.
Categorie 700 are definitions for the sphere with a = b = 637100.
Categorie 800 are definitions for the ellipsoid WGS84.
The unselectable items are projections that are not supported by MapServer version 6beta build with PROJ4 version 4.7.1
Layers:
MapServer baselayers (Country Area, Country Borders):
modified Natural Earth Country Shape, EPSG:4326, one with colored countries and the other only with country borders.
The gridlines are build of linesegment with a length of 1° to get smooth lines in the different projections.
MapServer Tissot layer:
the Tissot's indicatrix shows the distortion of the map.
Used MapServer versions to serve the MapServer layers:
Vector layer (World Data, EPSG:4326):
a rough sketch of the the continents with some country borders
Vector layer (world 10° grid 1° step, EPSG:4326):
The gridlines are build of linesegment with a length of 1° to get smooth lines in the different projections.
proj4js with the proj strings from the PROJ4 epsg file (version 4.8.0) are used to project the grid.
Vector layer (GraticuleXY):
The layer to display the grid from the GraticuleXY control.
execute the proj string from the textarea below
BaseLayer
toggles visibility of BaseLayer
GarticuleXY
toggles visibility of GarticuleXY
Vector Grid
toggles visibility of Vector Grid
layerImage
opens the wms layer with the map extent in a new window
refresh vectorlayer
refreshs the vectorlayer
mapCenter 0,0
sets the map center to 0,0
map init extent
sets the map to maxExtent
map 180 extent
sets the map to extent -180,-90,180,90
Proj4js.defs
shows the original proj string for the selected projection
find projection
finds a projection by epsg number
only supported (reasonable) for projections known to proj4js
The application accepts some parameters to restore a previous map
EPSG:28992 (sterea) - Netherland
EPSG:3035 (laea) - Europe
EPSG:4647 (utm) - like EPSG:25832 but with false easting x=32500000
| Map Projection Viewer - description | [x] |
are default definitions for all known projections of PROJ4. The code number is no real epsg code. It's only a generated key for the definition.
700200 +proj=aeqd +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m with a = b = (most likely) volumetric radius for ellipsiod WGS84 see Wikipedia:Earth_radius 800200 +proj=aeqd +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84 +units=mSeveral projections use specific parameters. A list derived from the PROJ4 source code shows the short name, name and type of the projections and the specific parameters.
PROJ_HEAD
example: 711500 +proj=tpers +h=500000000 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +a=6371000 +b=6371000 +units=m
Some Sources from gdal (Version 1.9)
Sources from Wikipedia
Source from crs.bkg.bund.de
for some projections Mapserver and proj4js reprojection seems strange. proj4js doesn't understand units=ft, known units only "m" and "degrees"
i.e WriteWMC - a function to create a WMC file, that can be used with OLClient.
- gis.ibbeck.de