I am trying to create a 100 sqkm (10 km by 10 km) KML square polygon with a point of interest centred right in the middle.
How do I do this?
Thank you.
Xu
handling polygons in google earth are rather tricky but also there is a lot of thing you can do with that. here's a sample of rather a mature example of a polygon kml file in google earth (it is a ship with very details) and also three link of tutorials that i have watched to creats polygons :
http://www.lynda.com/SketchUp-tutorials/SketchUp-6-Essential-Training/612-2.html?srchtrk=index:1%0Alinktypeid:2%0Aq:google%2Bearth%2Bpolygon%0Apage:1%0As:relevance%0Asa:true%0Aproducttypeid:2
http://www.lynda.com/ArcGIS-tutorials/Making-lines-polygons-Google-Earth/162136/186933-4.html
http://www.lynda.com/SketchUp-tutorials/Exporting-models-Google-Earth/612/41758-4.html
and also the kml file :
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiYy-n0k5zKAhVJ1hQKHbqJAVIQFggcMAA&url=http%3A%2F%2Fwww.gearthblog.com%2Fblog%2Farchives%2F2012%2F01%2F18%2FCosta%2520Concordia%2520on%2520the%2520rocks.kmz&usg=AFQjCNEhyEKuyKTF5oGds_OAVH3LgqPHpg&sig2=G_sIJeUBosCMZimbirndoQ
Related
I need a Google Map with marked up areas with different colors.
GADM data
The first article I came across was this one:
https://ourcodeworld.com/articles/read/830/how-to-highlight-an-area-city-state-or-country-in-google-maps-with-javascript
It links to this service for getting coordinates:
https://gadm.org/download_country_v3.html
The problem is that there are too many points so it would end up with 3MB for an embedded map.
Google Maps draw
Then I tried Google Maps service to draw a shape. While it works, I could not find any export function to get the longitude and latitude.
https://www.google.com/maps/d/u/0/viewer?mid=1IlydZDXB-tkN8K8pAR57BRFqBOTv3c8z&ll=59.681023024095936%2C18.40997752499993&z=9
Question
How can I draw an area on a map and then get longitude and latitude for the points? On Google Maps, a tool or something else does not matter.
I solved my problem very differently. I simply used an svg file of just the country and highlighted areas there.
I used this site:
https://simplemaps.com/custom/country
I have a table with a year's worth of wind data for a specific latitude longitude. I want to plot this as an arrow in Google Maps. Each data point has a timestamp, heading (true), and magnitude (knots), but it is just contained in a spreadsheet.
I was thinking the easiest way is to just create a new layer using geoJSON data, but I've never used geoJSON before.
How can I plot this in Google Map api v3? Thanks!
EDIT:
I did some research, and I think the best way is to just place a marker over the lat long point, and generate a ton of arrow images (probably in 5 degree and .5 knot increments, so I don't have a million images). Then just title each arrow based on its parameters (something like 01030.png, where 010 is the direction and 30 stands for 3.0 knots) and when the script calls for the marker image, just include those attributes when it calls for the image name.
I'll post the code when I make it, so other people can see.
I have made a map with a series of overlays of old maps that I created using MapTiler and the coordinates were definitely correct when I plotted them in Google Earth, but when I load the KML files in Google Maps they are roughly in the correct area but are far from accurate.
As the same error is replicated in all the layers can someone suggest what it is that I am doing wrong?
http://www.southdevonaonb.org.uk/cordialemapping/kmzdata/withtiledoverlays/19x/doc.kml
http://www.southdevonaonb.org.uk/cordialemapping/kmzdata/withtiledoverlays/20x/doc.kml
The other KML files can be found by changing the URL to 21x, 22, 23x, 25x, 26x, 27x (I am unable to post more than two links).
EDIT: Turns out it was all because the coordinate translation functions in the javascript were written wrong. The author of the program has apparently fixed it.
I'm trying to use KML files to display placemarks on a custom Google Maps map. The map was generated by a Minecraft mapping program called Unmined.
My problem lies with the positioning of placemarks. They are placed on the map in a position that doesn't seem to correlate with either the pixel or latitude/longitude coordinates of the map itself.
Here is an image showing my problem.
I loaded a KML with five placemarks defined. One in the middle (0,0), one in the top-left corner (-170,80), one in the top-right corner (170,80), one in the bottom-left corner (-170,-80), and one in the bottom-right corner (170,-80). The set of markers seems to be duplicated horizontally but from my experience that's standard with Google Maps. As far as I know, the range of valid coordinates in a KML file are from -180 to 180 longitude and -90 to 90 latitude, which means that any valid placemark would have to fall somewhere inside that rectangle. Except that rectangle barely intersects the map at all.
If you need access to the code I'm using, everything can be found in the source of http://tonyfox.ws/dt/kantomap/ (URL may not exist forever)
So am I just doing something catastrophically wrong or what?
On a related note, how does Google Maps decide where to place the map in the coordinate system when the map isn't an actual Earth map (like this Minecraft world map)? My map seems to range from about 14.5 to 19.5 longitude, and 25.5 to 28 latitude. Why such weird numbers?
I'm looking looking for a tool that will allow me to make a map exactly like this:
http://datasearch.uts.edu.au/about/mapsdirections/map.cfm
Basically I need to put shapes around buildings in the satellite view and then slap a marker and information window on them so that I can specify the building name and contents.
So the main issue is that I need the ability to draw shapes directly onto the maps as I don't fancy taking down the lat lng of each corner of the polygon.
Ideally what I'd like to do is have an online application that exports those points to KML, and then I would display google maps on my site and import that kml to display it.
Other suggestions welcome!
Jason
Found a polygon creator
http://www.the-di-lab.com/polygon/
It's simple to use and allows you to copy and paste straight into your code. Would be nice if it had a button that said sent to kml though..