I am preparing the map of Nepal with 75 districts using the KMZ file downloaded from global admin. I opened the KMZ file (NPL_admin3.kmz) in google earth pro. I produced the map, and also worked successfully with coloring the districts. But I could not put the name of the 75 districts in the map. In other GIS tools such as DIVA or Quantum, when we 'add label' under the 'layer' menu bar, we get the name associated to the boundary. But in google earth pro, I have been facing difficulty. Can anyone please help me?
[GIS] Adding labels in Google Earth Pro
google-earth-prolabeling
Related Solutions
I think that might be because there is no single, clear answer. I'll try to summarize my knowledge and the two most related questions:
- Google Earth, Google satellite, and Bing aerial accuracy
- How accurate are measurements in Google Earth?
Let's start by taking Google Earth and even GIS out of the equation and only consider how accurate a measurement on an image can be. If the resolution of an image is a pixel is 1m, and you are zoomed in far enough to see individual pixels (original, not resampled for display purposes), you can measure to within +/- 1m. Now let's get that into GIS, which requires both orthorectification and georeferencing. Both can introduce error. On top of which, you're looking at errors introduced by (re)projection.
Now let's put that all into Google Earth, which is providing you a seamless interface to multiple original sources. All of which may vary in their original resolution and quality of the above processes, so right off there is no single accuracy measurement. This is why Google has that disclaimer about accuracy:
Google makes no claims as to the accuracy of the coordinates in Google Earth. These are provided for entertainment only and should not be used for any navigational or other purpose requiring any accuracy whatsoever.
Our imagery varies from sub-meter resolution in major cities to 15 meter resolution for most of the earth's surface, with a global base resolution of 1KM. Since our database is constantly being updated, we cannot state a specific resolution for any geographic region.
Google acquires imagery from many different sources with many different file formats, projections and spectral characteristics. All imagery sources are fused into a single global database with a proprietary format that has been developed for the specific purpose of streaming to our client software.
Source, as linked in question 2 above.
All of that is just for the accuracy of the imagery you're measuring from. Then add in the user interface - how far out are you zoomed when you do your measurements? Far enough in to see those individual original pixels, if they're even available to you? Or out far enough to see the entire field, or the field and its surroundings? What display resolution is your computer running, and how accurate/precise is your hand with the cursor as you mark the boundary? What distortions are introduced by the projection(s) Google Earth uses, which may change depending on where you are looking. The best you can do is find something of known distance near your feature and see what it measures at to estimate the error in that area.
So the short answer is, it varies.
Google Maps Engine works with WGS84 EPSG-Code 4326, so you'll need to project the shapefile into the correct projection.
ArcGIS: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00170000007m000000
Best Answer
Try this. Rename your kmz to zip. Open the zip and rename the kml to txt (or just use open with).
With your kml open in notepad or some other text editor look for the part of the html that says "LabelStyle" and change the "scale" number (Mine said 0 and I changed it to 0.666667) delete the entry for anything else (mine had color set to a string of 0's). Save the edited text file and rename back to kml. Save the modified zip file and rename to kmz. This worked for me... some variation will likely work for you, but dynamic labels are what they are. I just let it label with the field it had already defaulted to... which in my case was a useful field... but you might need to modify something else in the html in your case.
Here is the unlabeled points
Made a copy of the kmz and renamed to zip
Renamed the kml in the zip to txt
Opened the text file and did a find for "LabelStyle"
Deleted the "color" text and changed the "scale" value to 0.666667
Saving and naming things back the way they were
rename your zip to kmz and open in GE