hey guys,
I have a problem.^^ I tried to solve it with the code snippet below. but I
do not get the output I want to.
I wanted something like this:
cell code E-coordinate [m] N-coordinate [m] attribute
1kmN3116E4582 4582436.9081 3116378.8266 10.1
1kmN3112E4584 4584523.7417 3112367.3833 10.3
but I got something like this:
objectheader cell code E-coordinate [m]
N-coordinate [m]
29303 1027mN4460E3035 -6.065937113828252E66 2.954988390438623E237
attribute
-6.065988000076415E66
what am I doing wrong? besides I tried to reject the column "object header"
because I used an example. But it does not work.
does anybody have any suggestions?
public class HDF5 {
private static String fname;
private static String DATASETNAME = "Grid";
private static int DIM0;
private static final int RANK = 1;
/**
* compoundDatatype class is used to capture basic externalization
information,
* strings need to have a Maximum Size specified
* @author Linda
*/
private static class CompoundDatatype {
protected static final int OBJHEADERSIZE = 2;
protected static final int MAGICNUMBER = 4;
protected static final int DOUBLESIZE = 8;
protected final static int MAXSTRINGSIZE = 90;
}
/**
* compound type class includes supporting Grid_Datatype class,
Grid_Datatype class could be external as well
* @author Linda
*/
private static class Grid {
static Grid_Datatype datatypes;
String cellcode;
double x_coordinate;
double y_coordinate;
double attribute;
Grid() {
datatypes = new Grid_Datatype();
}
public void writeExternal(ObjectOutput out) throws IOException {
for (int indx = 0; indx < Grid_Datatype.MAXSTRINGSIZE; indx++) {
if (indx < cellcode.length())
out.writeByte(cellcode.charAt(indx));
else
out.writeByte(0);
}
out.writeDouble(roundScale2(x_coordinate));
out.writeDouble(roundScale2(y_coordinate));
out.writeDouble(roundScale2(attribute));
}
}
/**
* method to create data set and write it to file
* @param gridList
* @param resolution
*/
public void createDataset(double[][] gridList, double resolution, String
name) {
DIM0 = gridList.length;
int file_id = -1;
int strtype_id = -1;
int memtype_id = -1;
int filetype_id = -1;
int dataspace_id = -1;
int dataset_id = -1;
long[] dims = {DIM0};
Grid[] grid_data = new Grid[DIM0];
byte[] dset_data = null;
// initialize data, initialize data via for loop
for (int i = 0; i < DIM0; i++) {
int north = (int) (gridList[i][0]/resolution);
int east = (int) (gridList[i][1]/resolution);
int intResolution = (int) resolution;
grid_data[i] = new Grid();
grid_data[i].cellcode = new String(intResolution + "m" + "N" +
north + "E" + east);
grid_data[i].x_coordinate = gridList[i][0];
grid_data[i].y_coordinate = gridList[i][1];
grid_data[i].attribute = gridList[i][2];
}
fname = name + ".hdf5";
// create a new file using default properties
try {
file_id = H5.H5Fcreate(fname, HDF5Constants.H5F_ACC_TRUNC,
HDF5Constants.H5P_DEFAULT, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// create string datatype
try {
strtype_id = H5.H5Tcopy(HDF5Constants.H5T_C_S1);
if (strtype_id >= 0)
H5.H5Tset_size(strtype_id, Grid_Datatype.MAXSTRINGSIZE);
}
catch (Exception e) {
e.printStackTrace();
}
// create compound datatype for memory
try {
memtype_id = H5.H5Tcreate(HDF5Constants.H5T_COMPOUND, Grid_Datatype
.getDataSize());
if (memtype_id >= 0) {
for (int indx = 0; indx < Grid_Datatype.numberMembers; indx++) {
int type_id = Grid.datatypes.memberMemTypes[indx];
if (type_id == HDF5Constants.H5T_C_S1)
type_id = strtype_id;
H5.H5Tinsert(memtype_id, Grid.datatypes.memberNames[indx],
Grid_Datatype.getOffset(indx), type_id);
}
}
}
catch (Exception e) {
e.printStackTrace();
}
// create compound datatype for the file because standard
// types we are using for file may have different sizes than
// corresponding native types, we must manually calculate
// offset of each member
try {
filetype_id = H5.H5Tcreate(HDF5Constants.H5T_COMPOUND, Grid_Datatype
.getDataSize());
if (filetype_id >= 0) {
for (int indx = 0; indx < Grid_Datatype.numberMembers; indx++) {
int type_id = Grid.datatypes.memberFileTypes[indx];
if (type_id == HDF5Constants.H5T_C_S1)
type_id = strtype_id;
H5.H5Tinsert(filetype_id, Grid.datatypes.memberNames[indx],
Grid_Datatype.getOffset(indx), type_id);
}
}
}
catch (Exception e) {
e.printStackTrace();
}
// create dataspace, setting maximum size to NULL sets maximum
// size to be current size
try {
dataspace_id = H5.H5Screate_simple(RANK, dims, null);
}
catch (Exception e) {
e.printStackTrace();
}
// create dataset
try {
if ((file_id >= 0) && (dataspace_id >= 0) && (filetype_id >= 0))
dataset_id = H5.H5Dcreate(file_id, DATASETNAME, filetype_id,
dataspace_id, HDF5Constants.H5P_DEFAULT);
}
catch (Exception e) {
e.printStackTrace();
}
// write compound data to dataset
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream(Grid_Datatype
.getTotalDataSize(DIM0));
ObjectOutputStream oout = new ObjectOutputStream(baos);
for (int indx = 0; indx < DIM0; indx++) {
grid_data[indx].writeExternal(oout);
oout.flush();
}
oout.close();
baos.close();
dset_data = baos.toByteArray();
byte[] write_data = new byte[dset_data.length-Grid_Datatype.MAGICNUMBER];
for(int indx=0; indx<dset_data.length-Grid_Datatype.MAGICNUMBER;indx++)
write_data[indx] = dset_data[indx+Grid_Datatype.MAGICNUMBER];
if ((dataset_id >= 0) && (memtype_id >= 0))
H5.H5Dwrite(dataset_id, memtype_id, HDF5Constants.H5S_ALL,
HDF5Constants.H5S_ALL, HDF5Constants.H5P_DEFAULT, write_data);
}
catch (Exception e) {
e.printStackTrace();
}
// end access to dataset and release resources used by it
try {
if (dataset_id >= 0)
H5.H5Dclose(dataset_id);
}
catch (Exception e) {
e.printStackTrace();
}
// terminate access to data space
try {
if (dataspace_id >= 0)
H5.H5Sclose(dataspace_id);
}
catch (Exception e) {
e.printStackTrace();
}
// terminate access to file type
try {
if (filetype_id >= 0)
H5.H5Tclose(filetype_id);
}
catch (Exception e) {
e.printStackTrace();
}
// terminate access to mem type
try {
if (memtype_id >= 0)
H5.H5Tclose(memtype_id);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (strtype_id >= 0)
H5.H5Tclose(strtype_id);
}
catch (Exception e) {
e.printStackTrace();
}
// close file
try {
if (file_id >= 0)
H5.H5Fclose(file_id);
JOptionPane.showMessageDialog(null, "Resampling and reprojecting to
Geographical Grid Systems complete!");
}
catch (Exception e) {
e.printStackTrace();
}
}
/**
* using Java Externalization will add a two-byte object header in
* stream, which needs to be called out in datatypes
* @author Linda
*/
private static class Grid_Datatype extends CompoundDatatype {
static int numberMembers = 5;
static int[] memberDims = {1, 1, 1, 1, 1};
String[] memberNames = {"ObjectHeader", "Cell code",
"x-Coordinate [m]", "y-Coordinate [m]", "Attribute"};
int[] memberMemTypes = {HDF5Constants.H5T_NATIVE_SHORT,
HDF5Constants.H5T_C_S1,
HDF5Constants.H5T_NATIVE_DOUBLE, HDF5Constants.H5T_NATIVE_DOUBLE,
HDF5Constants.H5T_NATIVE_DOUBLE};
int[] memberFileTypes = {HDF5Constants.H5T_STD_I16BE,
HDF5Constants.H5T_C_S1,
HDF5Constants.H5T_IEEE_F64BE, HDF5Constants.H5T_IEEE_F64BE,
HDF5Constants.H5T_IEEE_F64BE};
static int[] memberStorage = {OBJHEADERSIZE, MAXSTRINGSIZE,
DOUBLESIZE, DOUBLESIZE, DOUBLESIZE};
/**
* data size is storage size for members not object,
* Java Externalization also adds a 4-byte "Magic Number" to beginning
* of data stream
* @param DIM0
* @return
*/
static int getTotalDataSize(int DIM0) {
int data_size = 0;
for (int indx = 0; indx < numberMembers; indx++)
data_size += memberStorage[indx] * memberDims[indx];
return DIM0 * data_size + MAGICNUMBER;
}
/**
* method to get data size
* @return
*/
static int getDataSize() {
int data_size = 0;
for (int indx = 0; indx < numberMembers; indx++)
data_size += memberStorage[indx] * memberDims[indx];
return data_size;
}
/**
* method to get offset
* @param memberItem
* @return
*/
static int getOffset(int memberItem) {
int data_offset = 0;
for (int indx = 0; indx < memberItem; indx++)
data_offset += memberStorage[indx];
return data_offset;
}
}
/**
* method to round double values at two decimal places
* @param d
* @return
*/
public static double roundScale2(double d) {
return Math.rint(d*100)/100.;
}
}
···
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