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# OSGB 1936 / British National Grid <27700> +title=British National Grid +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996019996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +no_defs no_defs <> |
The first line is just a comment the next has the following formatting requirement:
| Code | Descrption |
|---|---|
<27700> | The SRID for the projection |
+title=British National Grid | The Title to display |
| The Projection definition. In order to find the correct definition for your required projection please see http://spatialreference.org/ref/ select the relevant entry and then click on the Proj4 link which will give you what you require. |
| <> | The end of line |
Remember that your Map Sources may be set up for WMS & WFS access. If your Map Sources' associated .map files are set up to support multiple projections then make sure the epsg file referenced contains all the necessary projection definitions. Below is a typical epsg file shortened to only include projections typically used with British data.
| Code Block |
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# WGS 84
<4326> +title=long/lat:WGS84 +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs no_defs <>
# ETRS89
<4258> +title=long/lat:ETRS89 +proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs no_defs <>
# OSGB 1936 / British National Grid
<27700> +title=British National Grid +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +datum=OSGB36 +units=m +no_defs <>
# TM75 / Irish Grid
<29903> +proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +b=6356034.447938534 +units=m +no_defs no_defs <>
# OSNI 1952 / Irish National Grid
<29901> +proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000000 +x_0=200000 +y_0=250000 +ellps=airy +units=m +no_defs no_defs <>
# IRENET95 / Irish Transverse Mercator
<2157> +proj=tmerc +lat_0=53.5 +lon_0=-8 +k=0.999820 +x_0=600000 +y_0=750000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs no_defs <>
# SR-ORG:6864
<3857> +proj=merc +lon_0=0 +k=1 +x_0=0 +y_0=0 +a=6378137 +b=6378137 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs <>
# EPSG:3035
<3035> +proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000 +ellps=GRS80 +units=m +no_defs <> |