15 replies to this topic

[Mourad gis]

hello every one ,
i've a question :
i've registered on the website and i insered my coordinates x and y , and i've find my self about 100 km from my place , can you help me to insert them exactelly ?
greetings ,

[Hans van der Maarel]

It looks like you entered them as degrees-minutes-seconds, if you put them in as decimal degrees it should work.

[Mourad gis]

oh yes i forgot this , thank you ,

[Mourad gis]

is there a software that can do it?

[frax]

I wouldn't worry about it, I don't think users look at that very closely!

[rudy]

I wouldn't worry about it, I don't think users look at that very closely!

But as cartographers we do worry about it. It's in our nerdy nature to do so.

[Hans van der Maarel]

I wouldn't worry about it, I don't think users look at that very closely!

But as cartographers we do worry about it. It's in our nerdy nature to do so.

We could do with a volunteer to redo that feature of the site. It's a not-so-nice php hack I did several years ago and I think there's room for improvement (but my skillset has migrated)

[frax]

I think google maps and google earth can interpret and recalculate that. Otherwise it is not so hard to do it by hand (simple math). If you google for it, you will also find services that will do the recalculation for you.

[SteveR]

The formula to convert degrees, minutes and seconds to decimal degrees is

degrees + (minutes/60) + (seconds/3600).

[Mourad gis]

thanks stever .

[Mourad gis]

i did this ,but the problem has not been resolved .
i think that i'll unsubscribe Forum for this reason because 1oo km in the field can makes milions of years of developpement

[SteveR]

I don't think this has anything to do with time, but maybe it does in astronomy.

On earth, geographic coordinates can be expressed in degrees, minutes, and seconds. There are 360 degrees longitude around the equator, and 90 degrees latitude from the equator to the pole. The values are positive east of Greenwich Observatory in London, and negative westward from Greenwich.

The latitude is a positive number north of the equator and negative south of the equator. A degree of latitude is about 111 kilometers north to south, but the measure of a degree of longitude gets smaller the closer you get to the pole (roughly the cosine of the latitude times 111 kilometers). The size of a degree of latitude varies a little because the earth isn't really a sphere.

A minute in this case is not a minute of time, but 1/60th of a degree.

A second is not a second of time, but 1/60th of a minute, or 1/3600th of a degree.

To either convert latitude or longitude 40 degrees 25 minutes and 27.5683 minutes to decimal degrees you would add the following:

40 + (25/60) + (27.5683/3600). This would be 40 + (0.416667) + (0.007658) = 40.424325 degrees.

Part of the problem might be that decimals may need to be separated by a period or a comma
( . or , ), and it's important to know which is expected. In the example above I've used periods.

I hope this helps.

[Mourad gis]

Thanks very much for eclairissements ,
but can you insert your coordinates in order to i see you at the capital of Algeria (Algiers ) ?
Greetings.

[SteveR]

I'm not sure what you mean, but here are the coordinates of my office in both formats:

Decimal Degrees:
40.7668127° N
111.885655° W

Hours, Minutes, Seconds:
40° 46' 0.5257" N
111° 53' 8.358" W


This is a location in Algiers:

Decimal Degrees:
36.751888° N
3.043711° E

Hours, Minutes, Seconds:
36° 45' 6.7968" N
3° 2' 37.3596" E

Are you aware of Google Earth?

[Mourad gis]

I think it is a matter of présition.
I used google earth to transfer the coordinated degree, minutes, seconds to degrees Decimals
I used 06 chiffres after the decimal point and was market.
thank you for all and I just continue like this in this forum.
GREETINGS.