From ce6c5db45473661b6cf4c0825df8ddc2b62289ba Mon Sep 17 00:00:00 2001
From: 13693261870 <252740454@qq.com>
Date: 星期六, 16 九月 2023 17:40:43 +0800
Subject: [PATCH] 优化栅格分析-面分析的速度
---
src/main/java/com/moon/server/service/data/RasterAnalysisService.java | 68 +++++++++++++++++++++++++++++++--
1 files changed, 63 insertions(+), 5 deletions(-)
diff --git a/src/main/java/com/moon/server/service/data/RasterAnalysisService.java b/src/main/java/com/moon/server/service/data/RasterAnalysisService.java
index a2866b4..19f0b96 100644
--- a/src/main/java/com/moon/server/service/data/RasterAnalysisService.java
+++ b/src/main/java/com/moon/server/service/data/RasterAnalysisService.java
@@ -37,6 +37,20 @@
private final static Log log = LogFactory.getLog(RasterAnalysisService.class);
/**
+ * 娴嬭瘯
+ */
+ public List<AnalysisResultEntity> test(Geometry geo, Integer size) {
+ List<AnalysisResultEntity> rs = new ArrayList<>();
+ AnalysisResultEntity entity = new AnalysisResultEntity();
+ entity.setLayerName("Test");
+
+ openRaster(entity, "D:\\Moon\\data\\DOM\\Lunar_LRO_LOLA_ClrShade_Global_128ppd_v04_2.tif", geo, size);
+ rs.add(entity);
+
+ return rs;
+ }
+
+ /**
* 鍒嗘瀽鏂规硶
*/
public List<AnalysisResultEntity> analysis(Geometry geo, Integer size) {
@@ -227,15 +241,53 @@
int yMaxPixel = (int) Math.floor((maxY - env[2]) / pixelHeight);
int bandCount = ds.getRasterCount();
- int geoWidth = Math.abs(xMaxPixel - xMinPixel);
- int geoHeight = Math.abs(yMaxPixel - yMinPixel);
+ int width = Math.abs(xMaxPixel - xMinPixel);
+ int height = Math.abs(yMaxPixel - yMinPixel);
+
+ if (width * height > StaticData.I64 * StaticData.I64) {
+ readRasterForBlocks(entity, ds, bandCount, xMinPixel, yMinPixel, width, height);
+ return;
+ }
for (int i = 1; i <= bandCount; i++) {
- double[] pixelValues = new double[geoWidth * geoHeight];
- ds.GetRasterBand(i).ReadRaster(xMinPixel, yMinPixel, geoWidth, geoHeight, pixelValues);
-
+ double[] pixelValues = new double[width * height];
+ ds.GetRasterBand(i).ReadRaster(xMinPixel, yMinPixel, width, height, pixelValues);
setBandVals(entity, pixelValues);
}
+ }
+
+ /**
+ * 鎸夌収鍧楄鍙栨爡鏍兼暟鎹�
+ */
+ private void readRasterForBlocks(AnalysisResultEntity entity, Dataset ds, int bandCount, int xMinPixel, int yMinPixel, int width, int height) {
+ List<Integer> xList = getSamples(xMinPixel, width);
+ List<Integer> yList = getSamples(yMinPixel, height);
+
+ double[] pixelValues = new double[1];
+ for (int i = 1; i <= bandCount; i++) {
+ List<Double> list = new ArrayList<>();
+ for (Integer x : xList) {
+ for (Integer y : yList) {
+ ds.GetRasterBand(i).ReadRaster(x, y, 1, 1, pixelValues);
+ list.add(pixelValues[0]);
+ }
+ }
+ setBandVals(entity, list);
+ }
+ }
+
+ /**
+ * 鑾峰彇鎶芥牱鍒楄〃
+ */
+ private List<Integer> getSamples(int start, int strip) {
+ List<Integer> list = new ArrayList<>();
+
+ double avg = 1.0 * strip / StaticData.I64;
+ for (int i = 0; i <= StaticData.I64; i++) {
+ list.add(start + (int) Math.ceil(avg * i));
+ }
+
+ return list;
}
/**
@@ -258,7 +310,13 @@
for (double val : pixelValues) {
list.add(val);
}
+ setBandVals(entity, list);
+ }
+ /**
+ * 璁剧疆Band鍊�
+ */
+ private void setBandVals(AnalysisResultEntity entity, List<Double> list) {
double min = Collections.min(list);
double max = Collections.max(list);
double avg = list.stream().mapToDouble(Double::valueOf).average().getAsDouble();
--
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