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ENVI实验报告

一、实验目的ENVI是一套功能齐全的遥感图像处理系统,是处理、分析并显示多光谱数据、高光谱数据和雷达数据的高级工具。

此次实习主要是学习一些关于ENVI的基本操作,如:图像预处理,影像分析,图像增强,几何校正,监督分类以及专题制图等步骤。

二、实验数据LE268SGS00.tar.gzELEVATION_SOURCE = "GLS2000"PROCESSING_SOFTWARE = "LPGS_9.1"EPHEMERIS_TYPE = "DEFINITIVE"SPACECRAFT_ID = "Landsat7"SENSOR_ID = "ETM+"SENSOR_MODE = "SAM"ACQUISITION_DATE = 2000-09-24WRS_PATH = 144BAND_COMBINATION = "123456678"PRODUCT_UL_CORNER_LAT = 45.5786828PRODUCT_UL_CORNER_LON = 84.0750064PRODUCT_UR_CORNER_LAT = 45.6157964PRODUCT_UR_CORNER_LON = 87.2821725PRODUCT_LL_CORNER_LAT = 43.5718357PRODUCT_LL_CORNER_LON = 84.1739972PRODUCT_LR_CORNER_LAT = 43.6064525PRODUCT_LR_CORNER_LON = 87.2726073PRODUCT_UL_CORNER_MAPX = 271800.000PRODUCT_UL_CORNER_MAPY = 5051400.000PRODUCT_UR_CORNER_MAPX = 522000.000PRODUCT_UR_CORNER_MAPY = 5051400.000PRODUCT_LL_CORNER_MAPX = 271800.000PRODUCT_LL_CORNER_MAPY = 4828200.000PRODUCT_LR_CORNER_MAPX = 522000.000PRODUCT_LR_CORNER_MAPY = 4828200.000三、实验容1.遥感数据下载2.数据格式转化及多波段的合成3.图像边框的裁剪4.图像的镶嵌6.图像几何校正7.裁剪8.监督分类9.专题出图四、实验步骤1.遥感数据下载输入地名及日期,搜索符合自己通途的数据,查看并下载2.数据格式转化及多波段的合成由于下载图像的格式tif格式,需要转成img格式。

并将单波段融合成为多波段,这一步在erdas中完成。

tif转img单波段融合成多波段3.图像边框的裁剪通过主图像窗口-tools-region of interest-roi tool,然后自己在图像上定义出一块感兴趣区(实际中难于确定严格准确的裁剪界限)。

4.图像的镶嵌Map→mosaicking→georeferenced启动镶嵌模板6.图像几何校正设置参数,参数在原始数据中的txt中可以查看启动校正模块,并利用google地球进行校正7.裁剪分别打开需要裁剪的图像和所在区域的shapefile文件将矢量文件转成ROI利用ROI裁剪图像选择主菜单→basic tools→subset data via ROIS,选择裁剪图像在spatial subset via ROI parameters中,选择由矢量生成的ROI,在“Mask pixels outside of ROI?”项中选择yes,Mask Background Value为08.监督分类打开裁剪后的图像,以RGB:543显示,在display中选择Overlay →Region of interest样本选择完成后,在Option→Compute ROI Separability,选择分类图像,查看分离性Input File: 裁剪ROI Name: (Jeffries-Matusita, Transformed Divergence)水体 [Blue] 36084 points:农田 [Green] 18122 points: (2.00000000 2.00000000)沙漠 [Sienna] 200333 points: (1.99973178 2.00000000)未利用土地 [Orchid] 57805 points: (1.99999494 2.00000000)山体 [Purple] 355228 points: (1.98296692 2.00000000)农田 [Green] 18122 points:水体 [Blue] 36084 points: (2.00000000 2.00000000)沙漠 [Sienna] 200333 points: (1.99954820 1.99999924)未利用土地 [Orchid] 57805 points: (2.00000000 2.00000000)山体 [Purple] 355228 points: (1.98744710 1.99928798)沙漠 [Sienna] 200333 points:水体 [Blue] 36084 points: (1.99973178 2.00000000)农田 [Green] 18122 points: (1.99954820 1.99999924)未利用土地 [Orchid] 57805 points: (1.98700177 2.00000000)山体 [Purple] 355228 points: (1.84635561 1.96524858)未利用土地 [Orchid] 57805 points:水体 [Blue] 36084 points: (1.99999494 2.00000000)农田 [Green] 18122 points: (2.00000000 2.00000000)沙漠 [Sienna] 200333 points: (1.98700177 2.00000000)山体 [Purple] 355228 points: (1.99987319 2.00000000)山体 [Purple] 355228 points:水体 [Blue] 36084 points: (1.98296692 2.00000000)农田 [Green] 18122 points: (1.98744710 1.99928798)沙漠 [Sienna] 200333 points: (1.84635561 1.96524858)未利用土地 [Orchid] 57805 points: (1.99987319 2.00000000)Pair Separation (least to most);沙漠 [Sienna] 200333 points and 山体 [Purple] 355228 points - 1.84635561水体 [Blue] 36084 points and 山体 [Purple] 355228 points - 1.98296692沙漠 [Sienna] 200333 points and 未利用土地 [Orchid] 57805 points - 1.98700177 农田 [Green] 18122 points and 山体 [Purple] 355228 points - 1.98744710农田 [Green] 18122 points and 沙漠 [Sienna] 200333 points - 1.99954820水体 [Blue] 36084 points and 沙漠 [Sienna] 200333 points - 1.99973178未利用土地 [Orchid] 57805 points and 山体 [Purple] 355228 points - 1.99987319水体 [Blue] 36084 points and 未利用土地 [Orchid] 57805 points - 1.99999494 水体 [Blue] 36084 points and 农田 [Green] 18122 points - 2.00000000农田 [Green] 18122 points and 未利用土地 [Orchid] 57805 points - 2.00000000 分类统计结果分类精度评价混淆矩阵Confusion Matrix: H:\123456\jianduOverall Accuracy = (646026/667344) 96.8055%Kappa Coefficient = 0.9486Ground Truth (Pixels)Class 水体农田沙漠未利用土地Unclassified 0 0 0 0 0水体 [Blue] 3 35922 0 0 0 286农田 [Green] 75 17907 48 0 19沙漠 [Sienna] 34 61 195813 536 15580未利用土地 [O 4 0 2166 57269 0山体 [Purple] 49 154 2306 0 339115Total 36084 18122 200333 57805 355000Ground Truth (Pixels)Class TotalUnclassified 0水体 [Blue] 3 36208农田 [Green] 18049沙漠 [Sienna] 212024未利用土地 [O 59439山体 [Purple] 341624Total 667344Ground Truth (Percent)Class 水体农田沙漠未利用土地山体Unclassified 0.00 0.00 0.00 0.00 0.00水体 [Blue] 3 99.55 0.00 0.00 0.00 0.08农田 [Green] 0.21 98.81 0.02 0.00 0.01沙漠 [Sienna] 0.09 0.34 97.74 0.93 4.39未利用土地 [O 0.01 0.00 1.08 99.07 0.00山体 [Purple] 0.14 0.85 1.15 0.00 95.53Total 100.00 100.00 100.00 100.00Ground Truth (Percent)Class TotalUnclassified 0.00水体 [Blue] 3 5.43农田 [Green] 2.70沙漠 [Sienna] 31.77未利用土地 [O 8.91山体 [Purple] 51.19Total 100.00Class Commission Omission Commission Omission(Percent) (Percent) (Pixels) (Pixels)水体 [Blue] 3 0.79 0.45 286/36208162/36084农田 [Green] 0.79 1.19 142/18049215/18122沙漠 [Sienna] 7.65 2.26 16211/2120244520/200333未利用土地 [O 3.65 0.93 2170/59439536/57805山体 [Purple] 0.73 4.47 2509/34162415885/355000Class Prod. Acc. User Acc. Prod. Acc. User Acc.(Percent) (Percent) (Pixels) (Pixels)水体 [Blue] 3 99.55 99.21 35922/3608435922/36208农田 [Green] 98.81 99.21 17907/1812217907/18049沙漠 [Sienna] 97.74 92.35 195813/200333195813/212024未利用土地 [O 99.07 96.35 57269/5780557269/59439山体 [Purple] 95.53 99.27 339115/355000339115/3416249.专题出图1、虚拟边框设置1)在主显示窗口菜单栏中选择File → Preferences,打开Display Parameters对话框,设置虚拟边框的边界值和颜色。

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