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image for domain part of tutorial
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‎first-coverage.md

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Learning by doing. That's how we will get to know the basic concepts of the CoverageJSON format.
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The image above is a visualization of what we will have achieved by the end of this short tutorial.
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It is a coverage which represents temperature in a very coarse resolution over Germany.
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It depicts a coverage which represents temperature in a very coarse resolution over Germany.
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Let's get started!

‎first-domain.md

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# Step 1: Spatial Domain
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![Coordinates of cell centers](images/playground_temperature_coverage_with_points_coordinates.png)
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```js
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{
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"type" : "Domain",

‎images/grid_with_points.covjson

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{
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"type": "CoverageCollection",
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"parameters" : {
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"TEMP": {
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"type" : "Parameter",
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"unit" : {
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"symbol" : "°C"
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},
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"observedProperty" : {
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"label" : {
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"en": "Temperature"
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}
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}
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}
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},
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"referencing": [{
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"components": ["x","y"],
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"system": {
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"type": "GeodeticCRS",
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"id": "http://www.opengis.net/def/crs/OGC/1.3/CRS84"
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}
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}],
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"coverages": [
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [7] }, "y" : { "values": [54] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [9.333] }, "y" : { "values": [54] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [11.667] }, "y" : { "values": [54] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [14] }, "y" : { "values": [54] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [7] }, "y" : { "values": [52] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [9.333] }, "y" : { "values": [52] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [11.667] }, "y" : { "values": [52] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [14] }, "y" : { "values": [52] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [7] }, "y" : { "values": [50] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [9.333] }, "y" : { "values": [50] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [11.667] }, "y" : { "values": [50] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [14] }, "y" : { "values": [50] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [7] }, "y" : { "values": [48] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [9.333] }, "y" : { "values": [48] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [11.667] }, "y" : { "values": [48] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Point",
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"axes": { "x" : { "values": [14] }, "y" : { "values": [48] } }
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},
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"ranges" : {
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"TEMP" : { "type" : "Range", "dataType": "float", "values" : [ 0 ] }
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}
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},
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{
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"type" : "Coverage",
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"profile" : "GridCoverage",
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"domain" : {
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"type" : "Domain",
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"profile" : "Grid",
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"axes": {
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"x" : { "start": 7, "stop": 14, "num": 4 },
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"y" : { "start": 54, "stop": 48, "num": 4 }
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},
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"rangeAxisOrder": ["y","x"]
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},
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"ranges" : {
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"TEMP" : {
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"type" : "Range",
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"dataType": "float",
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"values" : [
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17.3, 18.2, 16.5, 18.7,
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18.1, 19.4, 17.2, 18.6,
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19.2, 20.4, 21.1, 20.7,
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21.1, 21.3, 20.5, 19.2
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]
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}
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}
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}]
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}

‎images/playground_temperature_coverage_with_points.png

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‎images/playground_temperature_coverage_with_points_coordinates.png

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‎images/sources.txt

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- http://landsat.visibleearth.nasa.gov/view.php?id=78669
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london_etm_2002256_742_cropped_pixel.jpg
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- cropped/pixelated from london_etm_2002256_742.jpg
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- cropped/pixelated from london_etm_2002256_742.jpg
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playground_temperature_coverage.png
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- created from /examples/coverages/grid.covjson in CovJSON Playground
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playground_temperature_coverage_with_points.png
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- created from grid_with_points.covjson in CovJSON Playground
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playground_temperature_coverage_with_points_coordinates.png
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- manually annotated version of playground_temperature_coverage_with_points.png

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