I created a measuring tool from scratch and integrated it into the
toolbar. I use the lat and lon of the starting position and the ending
position to determine the distance using the Vicenty formula. I have
had success with it. I have compared it to Google's measuring tools in
Google Earth and Goog
Linda,
Not as much as I would have liked, but I did merge Chris's changes back
into the proj4js SVN and converted some more projection class code to
the correct format for proj4js. This wouldn't involve any changes to
the OpenLayers.Projection class code that we came up with at the code
sprin
Mike,
I was wondering if you had made progress on this project of yours.
Thanks,
Linda
Mike Adair wrote:
>
> FYI, I'm hoping to have the Proj4js (or cscs) library finished up in a
> few weeks so you should also be able to use that to convert point coords
> between projections, and do the mat
You probably already know it but the standard distance code is only
accurate in EPSG:4326 (LatLon)
and most CRS whose units are degrees it is pretty close as well.
In many/most other projections a linear distance n whatever units the
CRS uses (almost always meters)
is probably pretty useable.
FYI, I'm hoping to have the Proj4js (or cscs) library finished up in a
few weeks so you should also be able to use that to convert point coords
between projections, and do the math in map projected space.
Proj4js is a port of Proj4 to Javascript, and will use
spatialreference.org for lookup of
PS. If anyone is considering building this and would like to share the
code with the OL repository, we would (again) be delighted. Please
contact me or any of the other PSC members and we can set you up with
wiki/trac passwords, access to a sandbox, and help you with
code/design decisions.
On 8/
all:
Here is the official ticket in OL's TRAC for the path measuring tool:
http://trac.openlayers.org/ticket/173
There is also an open ticket for an *area* measuring tool:
http://trac.openlayers.org/ticket/782
Erik
On 8/20/07, Chris Hardin <[EMAIL PROTECTED]> wrote:
> It's been quite accurate
It's been quite accurate for me.
On 8/20/07, Lance Dyas <[EMAIL PROTECTED]> wrote:
> There is accurate distance measurement using the Vincenty distance
> formula...
> Haverine is umm simulating the earth as sphere and is not accurate.
> What Open Layers lacks is a gui for measurement.
>
--
Ch
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
> On Behalf Of Lance Dyas
> Sent: Monday, August 20, 2007 8:34 AM
> To: Chris Hardin
> Cc: users@openlayers.org; Erik Uzureau
> Subject: Re: [OpenLayers-Users] Measure Distance? Ruler?
>
>
There is accurate distance measurement using the Vincenty distance
formula...
Haverine is umm simulating the earth as sphere and is not accurate.
What Open Layers lacks is a gui for measurement.
___
Users mailing list
Users@openlayers.org
http://openlaye
Yeah, the calculation involves a little trig. I figure it would be an
easy feature to add. I use the following .js file to calculate it, I
just need to figure out how to feed it the starting point and ending
point and draw a line.
var EARTH_MEAN_RADIUS_MILES = 3959.87247;
var EARTH_ME
I know that there is a ticket for this in TRAC... and there may or may
not be work underway to solve this.
I know also that there are some wierd math-heavy functions in the (i
believe) Util.js file which can be used to calculate distance between
points.
It has for a while been a (low) MetaCarta p
I want to click a point and drag a line to another point on the map
and a measurement be given. I could write this myself, but I was
hoping there might already be something included or an add on I could
use. Does anyone have any ideas?
___
Users mailing l
13 matches
Mail list logo
