计算meanDEM ，计算影像范围区域行列有误

[farewell-lc]

in base.py

# DEM分辨率 pixelWidth = geotransform[1] pixelHight = geotransform[5]

# DEM起始点：左上角，X：经度，Y：纬度    originX = geotransform[0]    originY = geotransform[3]
# 研究区左上角在DEM矩阵中的位置    yoffset1 = int((originY - pointUL['lat']) / pixelWidth)    xoffset1 = int((pointUL['lon'] - originX) / (-pixelHight))
# 研究区右下角在DEM矩阵中的位置    yoffset2 = int((originY - pointDR['lat']) / pixelWidth)    xoffset2 = int((pointDR['lon'] - originX) / (-pixelHight))
# 研究区矩阵行列数    xx = xoffset2 - xoffset1    yy = yoffset2 - yoffset1    # 读取研究区内的数据，并计算高程    DEMRasterData = DEMBand.ReadAsArray(xoffset1, yoffset1, xx, yy)<br class="Apple-interchange-newline"><!--EndFragment-->

计算出的影像区域行列起始号与行列数存在问题，建议如下写法：

geo = ds.GetGeoTransform()
inv_geo = gdal.InvGeoTransform(geo)
pointUL = dict()
pointDR = dict()
pointUL["lat"] = float(''.join(re.findall('CORNER_UL_LAT_PRODUCT.+',data2)).split("=")[1])
pointUL["lon"] = float(''.join(re.findall('CORNER_LL_LON_PRODUCT.+',data2)).split("=")[1])
pointDR["lat"] = float(''.join(re.findall('CORNER_LR_LAT_PRODUCT.+',data2)).split("=")[1])
pointDR["lon"] = float(''.join(re.findall('CORNER_UR_LON_PRODUCT.+',data2)).split("=")[1])
extent = [pointUL["lon"], pointUL["lat"], pointDR["lon"], pointDR["lat"]]

off_ulx, off_uly = map(int, gdal.ApplyGeoTransform(inv_geo, extent[0], extent[1]))
off_drx, off_dry = map(math.ceil, gdal.ApplyGeoTransform(inv_geo, extent[2], extent[3]))
columns = off_drx - off_ulx
rows = off_dry - off_uly

data = ds.GetRasterBand(1).ReadAsArray(off_ulx, off_uly, columns, rows)