[SEDONA-193] Add Sedona NetCDF reader suite

common/pom.xml

@@ -118,6 +118,10 @@
             <version>${janino-version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>edu.ucar</groupId>
+            <artifactId>cdm-core</artifactId>
+        </dependency>
     </dependencies>
     <build>
         <sourceDirectory>src/main/java</sourceDirectory>

common/src/main/java/org/apache/sedona/common/raster/RasterConstructors.java

@@ -15,6 +15,7 @@
 
 import org.apache.sedona.common.FunctionsGeoTools;
 import org.apache.sedona.common.raster.inputstream.ByteArrayImageInputStream;
+import org.apache.sedona.common.raster.netcdf.NetCdfReader;
 import org.apache.sedona.common.utils.RasterUtils;
 import org.geotools.coverage.grid.GridCoverage2D;
 import org.geotools.coverage.grid.GridEnvelope2D;
@@ -28,6 +29,7 @@
 import org.geotools.geometry.jts.JTS;
 import org.geotools.geometry.jts.ReferencedEnvelope;
 import org.geotools.process.vector.VectorToRasterProcess;
+import org.geotools.referencing.CRS;
 import org.geotools.referencing.crs.DefaultEngineeringCRS;
 import org.geotools.referencing.operation.transform.AffineTransform2D;
 import org.geotools.util.factory.Hints;
@@ -38,13 +40,15 @@
 import org.opengis.referencing.crs.CoordinateReferenceSystem;
 import org.opengis.referencing.datum.PixelInCell;
 import org.opengis.referencing.operation.MathTransform;
+import ucar.nc2.NetcdfFile;
+import ucar.nc2.NetcdfFiles;
 
 import javax.media.jai.RasterFactory;
 import java.awt.image.WritableRaster;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 
 public class RasterConstructors
 {
@@ -58,6 +62,25 @@ public static GridCoverage2D fromGeoTiff(byte[] bytes) throws IOException {
         return geoTiffReader.read(null);
     }
 
+    public static GridCoverage2D fromNetCDF(byte[] bytes, String variableName, String lonDimensionName, String latDimensionName) throws IOException, FactoryException {
+       NetcdfFile netcdfFile = openNetCdfBytes(bytes);
+       return NetCdfReader.getRaster(netcdfFile, variableName, latDimensionName, lonDimensionName);
+    }
+
+    public static GridCoverage2D fromNetCDF(byte[] bytes, String recordVariableName) throws IOException, FactoryException {
+        NetcdfFile netcdfFile = openNetCdfBytes(bytes);
+        return NetCdfReader.getRaster(netcdfFile, recordVariableName);
+    }
+
+    public static String getRecordInfo(byte[] bytes) throws IOException {
+        NetcdfFile netcdfFile = openNetCdfBytes(bytes);
+        return NetCdfReader.getRecordInfo(netcdfFile);
+    }
+
+    private static NetcdfFile openNetCdfBytes(byte[] bytes) throws IOException {
+        return NetcdfFiles.openInMemory("", bytes);
+    }
+
     /**
     * Returns a raster that is converted from the geometry provided.
      * @param geom The geometry to convert
@@ -310,7 +333,31 @@ public static GridCoverage2D makeEmptyRaster(int numBand, String bandDataType, i
                 new GridEnvelope2D(0, 0, widthInPixel, heightInPixel),
                 PixelInCell.CELL_CORNER,
                 transform, crs, null);
-        return RasterUtils.create(raster, gridGeometry, null);
+        return RasterUtils.create(raster, gridGeometry, null, null);
+    }
+
+    public static GridCoverage2D makeNonEmptyRaster(int numBand, int widthInPixel, int heightInPixel, double upperLeftX, double upperLeftY, double scaleX, double scaleY, double skewX, double skewY, int srid, double[][] data, Map<String, List<String>> properties, Double noDataValue, PixelInCell anchor) throws FactoryException {
+        CoordinateReferenceSystem crs;
+        if (srid == 0) {
+            crs = DefaultEngineeringCRS.GENERIC_2D;
+        } else {
+            // Create the CRS from the srid
+            // Longitude first, Latitude second
+            crs = CRS.decode("EPSG:" + srid, true);
+        }
+
+        // Create a new empty raster
+        WritableRaster raster = RasterFactory.createBandedRaster(5, widthInPixel, heightInPixel, numBand, null); //create a raster with double values
+        for (int i = 0; i < numBand; i++) {
+            raster.setSamples(0, 0, widthInPixel, heightInPixel, i, data[i]);
+        }
+        //raster.setPixels(0, 0, widthInPixel, heightInPixel, data);
+        MathTransform transform = new AffineTransform2D(scaleX, skewY, skewX, scaleY, upperLeftX, upperLeftY);
+        GridGeometry2D gridGeometry = new GridGeometry2D(
+                new GridEnvelope2D(0, 0, widthInPixel, heightInPixel),
+                anchor,
+                transform, crs, null);
+        return RasterUtils.create(raster, gridGeometry, null, noDataValue, properties);
     }
 
     public static GridCoverage2D makeNonEmptyRaster(int numBands, String bandDataType, int widthInPixel, int heightInPixel, double upperLeftX, double upperLeftY, double scaleX, double scaleY, double skewX, double skewY, int srid, double[][] rasterValues) {

common/src/main/java/org/apache/sedona/common/raster/netcdf/NetCdfConstants.java

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.sedona.common.raster.netcdf;
+
+public class NetCdfConstants {
+    public static final String VALID_MIN = "valid_min";
+    public static final String VALID_MAX = "valid_max";
+    public static final String MISSING_VALUE = "missing_value";
+    public static final String VALID_RANGE = "valid_range";
+    public static final String SCALE_FACTOR = "scale_factor";
+    public static final String ADD_OFFSET = "add_offset";
+    public static final String LONG_NAME = "long_name";
+    public static final String UNITS = "units";
+    public static final String GLOBAL_ATTR_PREFIX = "GLOBAL_ATTRIBUTES";
+    public static final String VAR_ATTR_PREFIX = "VAR_";
+    public static final String BAND_ATTR_PREFIX = "BAND_";
+
+    public static final String INSUFFICIENT_DIMENSIONS_VARIABLE = "Provided variable has less than two dimensions";
+
+    public static final String NON_NUMERIC_VALUE = "An attribute expected to have numeric values does not have numeric value";
+
+    public static final String INVALID_LON_NAME = "Provided longitude variable short name is invalid";
+
+    public static final String INVALID_LAT_NAME = "Provided latitude variable short name is invalid";
+
+    public static final String INVALID_LAT_SHAPE = "Shape of latitude variable is supposed to be 1";
+
+    public static final String INVALID_LON_SHAPE = "Shape of longitude variable is supposed to be 1";
+
+    public static final String INVALID_RECORD_NAME = "Provided record variable short name is invalid";
+
+    public static final String COORD_VARIABLE_NOT_FOUND = "Corresponding coordinate variable not found for dimension %s";
+
+    public static final String COORD_IDX_NOT_FOUND = "Given record variable does not contain one of the latitude or longitude dimensions as the participating dimensions";
+}