wcst_import - document statements setting for general recipe

[Bang Pham Huu]

There is a non-documented statements for wcst_import general recipe, e.g:

 "statements": "from datetime import datetime"

This is used for importing different python libraries, which are used mostly for calculating the values for time axis in the ingredient files.

Also, if only datetime() function is used, it should not need to add the statements for it in the ingredients below:

{

	"config": {

		"service_url": "http://localhost:8082/rasdaman/ows",
		"tmp_directory": "/tmp/",
		"mock": false,
		"blocking": false,
        "track_files": false
	},

	"input": {

		"coverage_id": "dwd1",
		"paths": [
			"raster_taeglich_255_2010_255.tif"
		]

	},

	"recipe": {

		"name": "general_coverage",
		"options": {
			"coverage": {

				"crs": "OGC/0/AnsiDate?axis-label=\"time\"@EPSG/0/31467",

				"metadata": {
					"type": "xml",

    				"global": {
						"metadata1": "metadata1"
					}

				},

				"slicer": {

					"type": "gdal",
					"axes": {
						"time": {
                            "statements": "from datetime import datetime",
							"min": "datetime.strptime(regex_extract('${file:path}', '([0-9]{4}_[0-9]{3})(.[a-z]*$)', 1), '%Y_%j').strftime('%Y-%m-%d')",
							"gridOrder": 0,
							"crsOrder": 0,
							"type": "ansidate",
							"irregular": true,
							"dataBound": false
						},

						"East": {
							"min": "${gdal:minX}",
							"max": "${gdal:maxX}",
							"resolution": "${gdal:resolutionX}",
							"crsOrder": 1,
							"gridOrder": 1
						},

						"North": {
							"min": "${gdal:minY}",
							"max": "${gdal:maxY}",
							"resolution": "${gdal:resolutionY}",
							"crsOrder": 2,
							"gridOrder": 2
						}
					}
				}
			},

			"tiling": "ALIGNED [0:10, 0:*, 0:*]"

		}

	}



}