#PostGis CLC and SRTM server

Currently, only Corine Land Cover (CLC) data is being served. We have an express app using the postGis CLC client (see Usage> CLC modules), receiving arguments in the request body and sending the CLC array in with the response.send method. See expressApp.js

##modules in /src

These modules contain query scripts for Corine Land Cover (CLC) and SRTM height data access.

The idea is to get a rectangular area from the CLC layers stored in postgis and use that data to feed the fuel models of fireLib.

The output is a matrix where each element corresponds to a specific category of terrain (CLC format).

The SRTM module queries a database where the height data in WGS84 is stored, returning a rectangular area projected in ETRS89-LAEA.

##Usage

CLC module

var getCorine = require('clcClient');

getCorine( N, S, E, W, rows, cols, functions(data){ fuelMap = data });

• N, S, E, W are the limiting coordinates of the rectangular clip area (string format, Easting/Northing). eg: var W = 2660547; var E = 2666430; var N = 1954031; var S = 1948355;

• rows and cols are the resolution of the map

• The fuelMap is used in the call back function and it's in CLC format.

###SRTM module

var getSrtm = require('srtmClient');

getSrtm( N, S, E, W, functions(data){ heightMap = data });

• N, S, E, W are the same for CLC module

• rows and cols are the resolution of the map

• The heightMap is in meters and ETRS89-LAEA system.

CLC Output example

data = [111,111,311,111,...];

111 - Continuous urban fabric

311 - Broad-leaved forest

312 -

SRTM Output example

{ command: 'SELECT',
  rowCount: 625,
  oid: NaN,
  rows: 
   [ { st_metadata: '( EASTING, NORTHING,ROWS,COLS,PIXEL HEIGHT,PIXEL WIDTH,SKEWX,SKEWY,SRID,BAND)' },
     { x: 1, y: 1, height: 992 },
     { x: 1, y: 2, height: 1004 },
     { x: 1, y: 3, height: 111 },
     ...                          ] }

st_metadata contains information about the clipped raster. It's important to notice that, because of the way the clipping area intersects the raster pixels, the values for E/N of the clipped area will be slightly different from the input E/N at getSRTM.

##To do

• srtm modules needs tests
• express app needs tests