s*****e
发帖数: 422 | 1 I have a huge text file of points (1 million) with latitudes and longitudes.
Is there a fast way to identify the points inside the U.S. and keep them?
Thanks. | s*******1
发帖数: 146 | 2 First, you should have a US map (Polygon shapefile),
then, import your point data into ArcGIS, create a point shapefile,
then, clip the point shapefile by the US polygon shapefile,
you get a a clipped US polygon shapefile.In this map, the points in US have
been merged into the US map. Go to the dbf file associated with the clipped
file, you get the points in the US. You can import data into Excel or SAS
to do future analysis. | s*****e
发帖数: 422 | 3 I have a huge text file of points (1 million) with latitudes and longitudes.
Is there a fast way to identify the points inside the U.S. and keep them?
Thanks. | s*******1
发帖数: 146 | 4 First, you should have a US map (Polygon shapefile),
then, import your point data into ArcGIS, create a point shapefile,
then, clip the point shapefile by the US polygon shapefile,
you get a a clipped US polygon shapefile.In this map, the points in US have
been merged into the US map. Go to the dbf file associated with the clipped
file, you get the points in the US. You can import data into Excel or SAS
to do future analysis. | t********r
发帖数: 4908 | 5 Make sure you know the latitude and longitude
Nad1927 and wgs1984 are not the same
have
clipped
★ 发自iPhone App: ChineseWeb 8.1
【在 s*******1 的大作中提到】
: First, you should have a US map (Polygon shapefile),
: then, import your point data into ArcGIS, create a point shapefile,
: then, clip the point shapefile by the US polygon shapefile,
: you get a a clipped US polygon shapefile.In this map, the points in US have
: been merged into the US map. Go to the dbf file associated with the clipped
: file, you get the points in the US. You can import data into Excel or SAS
: to do future analysis.
|
|
