How to connect contour lines from two different sources (LiDAR & Photogarametry) in order to obtain continuous and uniform contour lines layer ? how can i interpolate them together ? How can i Snap lines only if they have the same Height value ?
[GIS] How to connect contour lines from two different sources
arcgis-desktopcontourinterpolationlidar
Related Solutions
In the Symbology tab you can classify your own values and apply to the contours
http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?tocVisable=0&ID=-1&TopicName=contours&pid=1
Firstly you need to understand that contours are not painted on the ground, they are a model. Secondly a TIN and a DEM are also models. With that in mind debating the relative inaccuracies of models of a model seems a little pointless.
When creating a contour from a TIN the process must internally convert to a raster or the only vertices created will be on the facets (lines joining nodes in the triangulation), the cell size used by this process is arbitrary, which is then contoured in the same manner as if you converted it to a raster yourself. In truth the answer lies in the cell size that is arbitrarily chosen by the process and the TIN to raster method, which you are unlikely to know.
If you want to know what the difference is then convert both contours to TIN, TIN to raster and then subtract one from the other, view this against the points you started with and you will find that the differences between both contours are least where there is a TIN node and most where there is significant distances between nodes, this is where interpolation occurs and whatever is happening here is subjective!
Best Answer
Since the distance between the lines in your two data sources can vary greatly (at least it looks like this on the picture), you might need to do some manual work. However, I'd suggest trying the Extend line GP tool (Editing toolbox) or Snap tool (same toolbox).
You might also test to use the Load Objects to load features from one source to another and set snapping settings. I use it quite often when "merging" road datasets from different sources and it reduces amount of manual work that will be needed to get done anyway.
There is a great blog post from Esri, where you can get more tips on data processing for such cases. They mention also using Integrate tool, Trim line and some other custom GP tools the Esri Editing team has published.