root / org.gvsig.toolbox / trunk / org.gvsig.toolbox / org.gvsig.toolbox.algorithm / src / main / java / es / unex / sextante / hydrology / cFactorFromNDVI / CFactorFromNDVIAlgorithm.java @ 59
History | View | Annotate | Download (2.49 KB)
1 |
package es.unex.sextante.hydrology.cFactorFromNDVI; |
---|---|
2 |
|
3 |
import es.unex.sextante.additionalInfo.AdditionalInfoNumericalValue; |
4 |
import es.unex.sextante.core.GeoAlgorithm; |
5 |
import es.unex.sextante.core.Sextante; |
6 |
import es.unex.sextante.dataObjects.IRasterLayer; |
7 |
import es.unex.sextante.exceptions.GeoAlgorithmExecutionException; |
8 |
import es.unex.sextante.exceptions.RepeatedParameterNameException; |
9 |
|
10 |
public class CFactorFromNDVIAlgorithm |
11 |
extends
|
12 |
GeoAlgorithm { |
13 |
|
14 |
public static final String ALPHA = "ALPHA"; |
15 |
public static final String BETA = "BETA"; |
16 |
public static final String NDVI = "NDVI"; |
17 |
public static final String CFACTOR = "CFACTOR"; |
18 |
|
19 |
private IRasterLayer m_NDVI = null; |
20 |
private IRasterLayer m_CFactor;
|
21 |
|
22 |
|
23 |
@Override
|
24 |
public boolean processAlgorithm() throws GeoAlgorithmExecutionException { |
25 |
|
26 |
int x, y;
|
27 |
int iNX, iNY;
|
28 |
double dNDVI;
|
29 |
double dAlpha, dBeta;
|
30 |
|
31 |
m_NDVI = m_Parameters.getParameterValueAsRasterLayer(NDVI); |
32 |
m_CFactor = getNewRasterLayer(CFACTOR, "C", IRasterLayer.RASTER_DATA_TYPE_FLOAT);
|
33 |
dAlpha = m_Parameters.getParameterValueAsDouble(ALPHA); |
34 |
dBeta = m_Parameters.getParameterValueAsDouble(BETA); |
35 |
|
36 |
m_NDVI.setWindowExtent(m_AnalysisExtent); |
37 |
|
38 |
iNX = m_NDVI.getNX(); |
39 |
iNY = m_NDVI.getNY(); |
40 |
|
41 |
for (y = 0; (y < iNY) && setProgress(y, iNY); y++) { |
42 |
for (x = 0; x < iNX; x++) { |
43 |
dNDVI = m_NDVI.getCellValueAsDouble(x, y); |
44 |
if (m_NDVI.isNoDataValue(dNDVI)) {
|
45 |
m_CFactor.setNoData(x, y); |
46 |
} |
47 |
else {
|
48 |
m_CFactor.setCellValue(x, y, Math.exp(-dAlpha * dNDVI / (dBeta - dNDVI)));
|
49 |
} |
50 |
} |
51 |
} |
52 |
|
53 |
|
54 |
return !m_Task.isCanceled();
|
55 |
} |
56 |
|
57 |
|
58 |
@Override
|
59 |
public void defineCharacteristics() { |
60 |
|
61 |
setName(Sextante.getText("C_factor_from_NDVI"));
|
62 |
setGroup(Sextante.getText("Indices_and_other_hydrological_parameters"));
|
63 |
setUserCanDefineAnalysisExtent(true);
|
64 |
|
65 |
try {
|
66 |
m_Parameters.addInputRasterLayer(NDVI, "NDVI", true); |
67 |
m_Parameters.addNumericalValue(ALPHA, "Alpha", 1., AdditionalInfoNumericalValue.NUMERICAL_VALUE_DOUBLE); |
68 |
m_Parameters.addNumericalValue(BETA, "Beta", 2., AdditionalInfoNumericalValue.NUMERICAL_VALUE_DOUBLE); |
69 |
addOutputRasterLayer(CFACTOR, Sextante.getText("C"));
|
70 |
} |
71 |
catch (final RepeatedParameterNameException e) { |
72 |
Sextante.addErrorToLog(e); |
73 |
} |
74 |
|
75 |
} |
76 |
|
77 |
} |