shape files with same projection but don't overlay

Environgis · ‎08-09-2014

I have data of shape files (lakes of same area) from two different years...one file have UTM WGS1984 projection while other have WGS1984 Zone 43N,I have to overlay them for analysis but even after giving them same projection, it doesn't work.Any solution please?

DanPatterson_Retired · ‎08-09-2014

the first file has no zone designation. I would check both files to see if they are indeed 43N...perhaps one is a GCS which means that it is not projected at all.

RobertScheitlin__GISP · ‎08-09-2014

Environ gis,

Are you sure you are posting in the right space? Are you using my ArcGIS Viewer for Flex Shapefile widget? It may help to attach your shapefiles so we can look at their actual projection.

curtvprice · ‎08-09-2014

after giving them same projection

This may be a key here. Did you use the Define Projection tool? That is the wrong tool to use as it only changes the description of the xy values. You should use the Project tool if you intend to project the data from one coordinate system into another.

stefanstamenov · ‎08-09-2014

Project the layers again in one projection.

Environgis · ‎08-10-2014

i projected them in 43N and in UTM as well but it didn't work.

DanPatterson_Retired · ‎08-10-2014

Assuming you are using ArcMap, go into ArcCatalog and copy and paste the coordinate system information. One may be "defined" as UTM 43N but it may not be projected as such. If they were properly defined and/or projected they would line up. The error lies with way this was done.

Environgis · ‎08-11-2014

Thank you Sir.. in Arc Catalog, files are projected much better as compared to arc map

Environgis · ‎08-12-2014

As I have to find out lakes of 2005 that are present in 2013, newly appeared and disappeared lakes... can you recommend which tool I should use? e.g intersect or ???

curtvprice · ‎08-12-2014

Union is probably the tool you want.