TIN 转栅格 (3D Analyst)
插图
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用法
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由于以均匀的间隔对输入 TIN 表面进行插值，因此输出栅格中可能会出现信息的丢失。栅格是否能够准确地表示 TIN 将取决于栅格的分辨率及 TIN 表面的变化程度和间隔。通常，分辨率越高，输出栅格就越能准确地表示 TIN 表面。因为栅格是像元结构，所以它无法保持可能出现在输入 TIN 中的硬隔断线和软隔断线的边。
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您可以接受 TIN 的 XMIN 和 YMIN 作为默认原点，接受 XMAX 和 YMAX 作为范围的右上角，以生成覆盖 TIN 完整范围的栅格数据。此外，您可以指定输出栅格的原点、范围和分辨率或像元间距以创建仅覆盖部分 TIN 的栅格。
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When exporting a large raster, consider specifying the Output Data Type as an integer to save on disk space if the accuracy requirements of your z-values are such that they can be represented by integer data.
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输出栅格可能是基于文件的，也可能作为地理数据库中的栅格数据集创建。支持的基于文件的格式包括 Esri Grid、ERDAS IMAGINE 和 TIFF。基于输出名称确定格式。如果输出路径引用地理数据库，则将创建地理数据库栅格。如果输出栅格位于普通文件夹中，不包含文件扩展名，则会生成 Esri Grid 格式的栅格。使用扩展名“.img”和“.tif”将生成 IMAGINE 或 TIFF 文件。
语法
| 参数 | 说明 | 数据类型 |
in_tin |
The input TIN. | TIN Layer |
out_raster |
The location and name of the output raster. When storing a raster dataset in a geodatabase or in a folder such as an Esri Grid, no file extension should be added to the name of the raster dataset. A file extension can be provided to define the raster's format when storing it in a folder:
If the raster is stored as a TIFF file or in a geodatabase, its raster compression type and quality can be specified using geoprocessing environment settings. | Raster Dataset |
data_type （可选） |
The data type of the output raster can be defined by the following keywords:
| String |
method （可选） |
用于创建栅格的插值方法。
| String |
sample_distance sampling_method distance （可选） |
The sampling method and distance used to define the cell size of the output raster.
| String |
z_factor （可选） |
The factor by which elevation values will be multiplied. This is typically used to convert Z linear units that match those of the XY linear units. The default is 1, which leaves elevation values unchanged. | Double |
代码示例
The following sample demonstrates the use of this tool in the Python window:
import arcpy
from arcpy import env
arcpy.CheckOutExtension("3D")
env.workspace = "C:/data"
arcpy.TinRaster_3d("tin", "raster.img", "INT", "LINEAR", "OBSERVATIONS 250", 1)
The following sample demonstrates the use of this tool in a stand-alone Python script:
'''******************************************************************
Name: TinRaster Example
Description: This script demonstrates how to use the
TinRaster tool to create rasters from
each TIN in the target workspace.
******************************************************************'''
# Import system modules
import arcpy
from arcpy import env
import exceptions, sys, traceback
try:
arcpy.CheckOutExtension("3D")
# Set environment setting
env.workspace = "C:/data"
# Set Local Variables
dataType = "INT"
method = "NATURAL_NEIGHBORS"
sampling = "CELLSIZE 10"
zfactor = "1"
# Create list of TINs
TINList = arcpy.ListDatasets("*", "Tin")
# Verify the presence of TINs in the list
if TINList:
# Iterate through the list of TINs
for dataset in TINList:
# Define the name of the output file
outRaster = "{0}_natural.img".format(dataset)
# Execute TinRaster
arcpy.ddd.TinRaster(dataset, outRaster, dataType,
method, sampling, zfactor)
print "Finished."
else:
print "There are no TIN(s) in {0}.".format(env.workspace)
arcpy.CheckInExtension("3D")
except arcpy.ExecuteError:
print arcpy.GetMessages()
except:
# Get the traceback object
tb = sys.exc_info()[2]
tbinfo = traceback.format_tb(tb)[0]
# Concatenate error information into message string
pymsg = 'PYTHON ERRORS:\nTraceback info:\n{0}\nError Info:\n{1}'\
.format(tbinfo, str(sys.exc_info()[1]))
msgs = 'ArcPy ERRORS:\n {0}\n'.format(arcpy.GetMessages(2))
# Return python error messages for script tool or Python Window
arcpy.AddError(pymsg)
arcpy.AddError(msgs)