基于微灌工程设计成果数据的农田电子地图构建方法

Method for constructing farmland electronic map based on micro-irrigation engineering design data

针对包含微灌设备的农田中电子地图获取成本高的问题,提出了一种基于微灌工程设计成果数据快速构建起农田电子地图的方法.考虑到微灌工程设计成果数据和农田电子地图2种数据的数据模型和对不同空间要素的表达方式之间存在着一定的差异,在微灌工程设计成果数据中存在着对微灌设备等空间要素的夸张、简化和省略等情况,而且数据中往往缺乏对微灌设备等空间要素的地理空间位置信息描述.在对微灌工程进行系统了解的基础上,通过深入分析设计成果数据和农田电子地图2种数据之间数据模型和要素表达方式之间的差异性,提出了采用DWGDirect.NET类库和ArcGIS Engine二次开发相结合进行解析转换的方法,将CAD格式的设计成果数据转换为GIS所支持的Geodatabase格式,初步构建起微灌工程农田电子地图,为微灌工程施工作业提供参考,同时也为精准农业提供农田电子地图基础数据.

In view of high cost of electronic map acquisition in farmland with micro-irrigation equipment,a method for rapidly constructing electronic map of farmland based on micro-irrigation enginee-ring design data was proposed.There are some differences in models and expressions of various spatial elements between micro-irrigation engineering design data and farmland electronic map data,especially there are exaggeration,simplification and omission etc for spatial elements in micro-irrigation equipment in the micro-irrigation engineering design data.Importantly,there is often a lack of geographic location information description for micro-irrigation equipment and other spatial elements in the data.Considering those key points,based on the systematic understanding of micro-irrigation enginee-ring,and through an in-depth analysis of the differences between data model and element expression from design data and farmland electronic map data,an analytical transform method was presented.In the method the DWGDirect.NET class library was combined with user programs of ArcGIS Engine to convert the design data in CAD format to the geodatabase format supported by GIS.As a result,a micro-irrigation engineering farmland electronic map was preliminarily constructed.It provides a refe-rence for micro-irrigation engineering construction,and also supplies basic data of farmland electronic map to precision agriculture.