地圖配準(zhǔn)及矢量化ppt課件-資料下載頁
2025-01-14 13:14本頁面
【正文】 g – Document is saved or closed – ArcGIS is closed ④ 點(diǎn)要素的編輯 ? 在圖層中新建、刪除、移動一個點(diǎn)要素 ⑤ 線要素的編輯 ? 懸掛功能 ? 修改線段的形狀（編輯頂點(diǎn)） ? 分割線要素、公共頂點(diǎn)的編輯 ? 合并線要素 ? 封閉線段 打斷線要素 打斷工具 封閉線段 ⑥ 多邊形要素的編輯 ? 多邊形頂點(diǎn)編輯（改變形狀） ? 分割多邊形 ? 公共邊的編輯 ? 要素合并（ Union）：求并集，比如：由多個島嶼組成的行政區(qū)，飛地。 ? 要素聯(lián)合（ Combine): 中心有島嶼的湖泊 ? 要素相減（ Subtract）：去除重疊部分（ landuse) ? 要素相交（ Intersection): 獲取多個多邊形的公共部分 Altering the shape of lines and polygons topological editing Altering the shape of lines and polygons nontopological editing Splitting (cutting) polygons Splitting features ? Geodatabase splitting policies ? Attributes are handled by policies – Duplicate: values in new records are copied from the parent record – Geometry property (., area, perimeter, length) automatically handled – Geometry ratio (., population)_ Splitting features ? Attribute splitting (for geodatabase feature classes) is handled by policies image from ESRI Merging polygons select multiple polygons from the same layer original polygons are merged into a single new polygon Merging polygons ? Attributes are handled by rules in the same way as splitting image from ESRI Unioning polygons ? similar to merge, but can bine features from 1 layer Intersecting polygons ? spatial area as the set for intersection ? mon areas are preserved ? like mathematical intersection Intersecting polygons Clipping polygons when overlapping polygons are bined, an erase occurs Clipping polygons
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