Hydrography and nautical charting.
Offshore of Faial island the Zero Hidrografico (CD Portugal) surface is defined to be 1.0m below the Horta vertical reference surface.
Portugal - central Azores - Faial island - nearshore.
(0,)
Definition: OGC Well Known Text 2 (2019)
CONCATENATEDOPERATION["Horta height to ZH Portugal depth (1)", VERSION["IH-Por Faial"], SOURCECRS[ VERTCRS["Horta height", VDATUM["Horta"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], ID["EPSG",6181]]], TARGETCRS[ VERTCRS["ZH Portugal depth", VDATUM["Chart Datum Portugal "], CS[vertical,1], AXIS["depth (D)",down, LENGTHUNIT["metre",1]], ID["EPSG",10349]]], STEP[ CONVERSION["Height <> Depth Conversion", METHOD["Height Depth Reversal", ID["EPSG",1068]], ID["EPSG",7812]]], STEP[ COORDINATEOPERATION["Horta depth to ZH Portugal depth (1)", VERSION["IH-Por Faial"], SOURCECRS[ VERTCRS["Horta depth", VDATUM["Horta"], CS[vertical,1], AXIS["depth (D)",down, LENGTHUNIT["metre",1]], ID["EPSG",10373]]], TARGETCRS[ VERTCRS["ZH Portugal depth", VDATUM["Chart Datum Portugal "], CS[vertical,1], AXIS["depth (D)",down, LENGTHUNIT["metre",1]], ID["EPSG",10349]]], METHOD["Vertical Offset", ID["EPSG",9616]], PARAMETER["Vertical Offset",-1, LENGTHUNIT["metre",1], ID["EPSG",8603]], OPERATIONACCURACY[0.0], ID["EPSG",10385], REMARK["Offshore of Faial island the Zero Hidrografico (CD Portugal) surface is defined to be 1.0m below the Horta vertical reference surface."]]], OPERATIONACCURACY[0.0], USAGE[ SCOPE["Hydrography and nautical charting."], AREA["Portugal - central Azores - Faial island - nearshore."], BBOX[38.46,-28.91,38.7,-28.53]], ID["EPSG",10397], REMARK["Offshore of Faial island the Zero Hidrografico (CD Portugal) surface is defined to be 1.0m below the Horta vertical reference surface."]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "ConcatenatedOperation", "name": "Horta height to ZH Portugal depth (1)", "source_crs": { "type": "VerticalCRS", "name": "Horta height", "datum": { "type": "VerticalReferenceFrame", "name": "Horta" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 6181 } }, "target_crs": { "type": "VerticalCRS", "name": "ZH Portugal depth", "datum": { "type": "VerticalReferenceFrame", "name": "Chart Datum Portugal " }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Depth", "abbreviation": "D", "direction": "down", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 10349 } }, "steps": [ { "type": "Conversion", "name": "Height <> Depth Conversion", "method": { "name": "Height Depth Reversal", "id": { "authority": "EPSG", "code": 1068 } }, "id": { "authority": "EPSG", "code": 7812 } }, { "type": "Transformation", "name": "Horta depth to ZH Portugal depth (1)", "source_crs": { "type": "VerticalCRS", "name": "Horta depth", "datum": { "type": "VerticalReferenceFrame", "name": "Horta" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Depth", "abbreviation": "D", "direction": "down", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 10373 } }, "target_crs": { "type": "VerticalCRS", "name": "ZH Portugal depth", "datum": { "type": "VerticalReferenceFrame", "name": "Chart Datum Portugal " }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Depth", "abbreviation": "D", "direction": "down", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 10349 } }, "method": { "name": "Vertical Offset", "id": { "authority": "EPSG", "code": 9616 } }, "parameters": [ { "name": "Vertical Offset", "value": -1, "unit": "metre", "id": { "authority": "EPSG", "code": 8603 } } ], "accuracy": "0.0", "id": { "authority": "EPSG", "code": 10385 }, "remarks": "Offshore of Faial island the Zero Hidrografico (CD Portugal) surface is defined to be 1.0m below the Horta vertical reference surface." } ], "accuracy": "0.0", "scope": "Hydrography and nautical charting.", "area": "Portugal - central Azores - Faial island - nearshore.", "bbox": { "south_latitude": 38.46, "west_longitude": -28.91, "north_latitude": 38.7, "east_longitude": -28.53 }, "id": { "authority": "EPSG", "code": 10397 }, "remarks": "Offshore of Faial island the Zero Hidrografico (CD Portugal) surface is defined to be 1.0m below the Horta vertical reference surface." }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-1"> <Layer srs="+proj=pipeline +step +proj=axisswap +order=1,2,-3 +step +proj=geogoffset +dh=-1"> </Layer> </Map>