So Similar: 2011

Tuesday, December 27, 2011

easa remote sensing

nice course on remote sensing

http://www.tiger.esa.int/TrainingCds/cd_01/content_2/pg2_1_menu.htm

Monday, December 26, 2011

Pearsons Coeff.

Use Pearsons for correlation. Wheat yield and rainfall

http://www.sciencemag.org/content/334/6062/1502.summary

Wednesday, December 14, 2011

NetCDF Files

Couple ways to do netcdf files

roll your own reader

http://www.unidata.ucar.edu/software/netcdf-java/documentation.htm

use nasas panoploy to open and then export as labeled text file. because there are so many nulls you could clean the file by removing nulls

http://www.giss.nasa.gov/tools/panoply/

use noass weather climate toolkit.

http://www.ncdc.noaa.gov/oa/wct/batch.php#Exporter

awesome for doing easy animations of the data. you can export as esrii.asc file which is awesome. unfortunately you cannot export everything to .asc file from the interface but there should be a way to batch process that task.

Monday, June 6, 2011

natural earth shapes

http://www.naturalearthdata.com/downloads/10m-cultural-vectors/

Thursday, June 2, 2011

raphaeljs on google maps

http://groups.google.com/group/google-maps-js-api-v3/msg/42873324a05b6306

+ 2 convenient methods to convert map coordinates to canvas
coordinates and back.

This works for me with any zoom on the map.

/**
* Draw with raphael library over google map.
*/
function RaphaelOverlay() {

}

RaphaelOverlay.prototype = new google.maps.OverlayView();

/**
* Convert lan/lng map coordinates to the canvas point coordinates.
*/
RaphaelOverlay.prototype.fromLatLngToCanvasPixel = function(latLng) {
var divPixel = this.getProjection().fromLatLngToDivPixel(latLng);

var left = this.canvasCenter.x - this.canvasWidth / 2;
var top = this.canvasCenter.y - this.canvasHeight / 2;

var x = divPixel.x - left;
var y = divPixel.y - top;

var canvasPixel = new google.maps.Point(x, y);

return canvasPixel;

}

/**
* Convert canvas point coordinates to the lan/lng map coordinates.
*/
RaphaelOverlay.prototype.fromCanvasPixelToLatLng =
function(canvasPixel) {

// borders of the map
var left = this.canvasCenter.x - this.canvasWidth / 2;
var top = this.canvasCenter.y - this.canvasHeight / 2;

// point coondinates on the canvas layer
var x = canvasPixel.x + left;
var y = canvasPixel.y + top;

var divPixel = new google.maps.Point(x, y);
var latLng = this.getProjection().fromDivPixelToLatLng(divPixel);

return latLng;

}

RaphaelOverlay.prototype.onAdd = function() {
// painting for the layer
this.div = document.createElement('div');
this.div.style.border = 'none';
this.div.style.position = 'absolute';
this.div.style.overflow = 'visible';

this.getPanes().overlayImage.appendChild(this.div);
this.canvas = Raphael(this.div);

};

RaphaelOverlay.prototype.draw = function() {
this.canvasCenter =
this.getProjection().fromLatLngToDivPixel(this.getMap().getCenter());
this.canvasWidth = Math.min(this.getProjection().getWorldWidth(),
60000);
this.canvasHeight = Math.min(this.getProjection().getWorldWidth(),
60000);

this.div.style.left = this.canvasCenter.x - this.canvasWidth / 2 +
'px';
this.div.style.top = this.canvasCenter.y - this.canvasHeight / 2 +
'px';
this.div.style.width = this.canvasWidth + 'px';
this.div.style.height = this.canvasHeight + 'px';

this.canvas.setSize(this.canvasWidth, this.canvasHeight);

rebuildPath(this, this.canvas);

};

RaphaelOverlay.prototype.onRemove = function() {
this.div.parentNode.removeChild(this.div);

};