LOS Graph all Mangled

[SnicketsCPT]

Hi

I Have installed Wind v1.0.1 and when I attempt to do a Line Of Sight Survey, my Graph is all mangled as below image, I am really desperate to get this to work any help would be greatly appreciated.

Many Thanks

[jammin84]

I've done some changes on this recently. As it didn't work at all for south
of the equator due to how the srtm file is read. When I get a chance I'll
upload the changes.
On 2 Jun 2015 8:40 pm, "SnicketsCPT" [email protected] wrote:

Hi

I Have installed Wind v1.0.1 and when I attempt to do a Line Of Sight
Survey, my Graph is all mangled as below image, I am really desperate to
get this to work any help would be greatly appreciated.
[image: los]
https://cloud.githubusercontent.com/assets/12714077/7935953/35b083da-0935-11e5-9346-27eda27785fa.jpg

Many Thanks

—
Reply to this email directly or view it on GitHub
#70.

[SnicketsCPT]

Thanks so much. I will wait for the upload.

Kind Regards

CJ Van Vuuren
[2dbcf32]

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From: jammin84 [mailto:[email protected]]
Sent: 02 June 2015 04:47 PM
To: wind-project/wind
Cc: CJ van Vuuren
Subject: Re: [wind] LOS Graph all Mangled (#70)

I've done some changes on this recently. As it didn't work at all for south
of the equator due to how the srtm file is read. When I get a chance I'll
upload the changes.
On 2 Jun 2015 8:40 pm, "SnicketsCPT" [email protected]:[email protected]> wrote:

Hi

I Have installed Wind v1.0.1 and when I attempt to do a Line Of Sight
Survey, my Graph is all mangled as below image, I am really desperate to
get this to work any help would be greatly appreciated.
[image: los]
https://cloud.githubusercontent.com/assets/12714077/7935953/35b083da-0935-11e5-9346-27eda27785fa.jpg

Many Thanks

—
Reply to this email directly or view it on GitHub
#70.

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/70#issuecomment-107978252.

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[SnicketsCPT]

Hi Jammin84

Did you perhaps have time to upload the changes?

Many Thanks

[jammin84]

Hi SnicketsCPT,

The changes I've made will only work for Southern Hemisphere ... I've
just been lazy and copy/pasted in below but it really needs some merging
and testing so both north/south will work simultaneously.

this is for file globals/classes/srtm.php

class srtm {

    var $data_path;

    function __construct($data_path='') {
            $this->data_path = $data_path;
    }

    public static function get_filename($lat, $lon) {
            $ll = srtm::get_lat_long_adjustments($lat, $lon);
            //print_R($ll);
            $n_lat = ($lat+$ll['lat_adj']);
            $n_lon = ($lon+$ll['lon_adj']);
            return $ll['lat_dir'] . sprintf("%02.0f",

abs((integer)($lat+$ll['lat_adj'])))
.$ll['lon_dir'].sprintf("%03.0f",
abs((integer)($lon+$ll['lon_adj']))).'.hgt';
}

    function get_lat_long_adjustments($lat,$lon) {
            //adjustment for filenames.
            // as the filename is based upon the bottom left corner
            // S locations will be records for -31.0 to -31.9 in a S32

file.
if ($lat < 0) {
$r['lat_dir'] = 'S';
$r['lat_adj'] = -1;
} else {
$r['lat_dir'] = 'N';
$r['lat_adj'] = 0;
}
if ($lon < 0) {
$r['lon_dir'] = 'W';
$r['lon_adj'] = 0;
} else {
$r['lon_dir'] = 'E';
$r['lon_adj'] = 0;
}
return $r;
}

    function get_elevation($lat, $lon, $round=TRUE) {

            $filename = $this->data_path.$this->get_filename($lat,$lon);
            if ($lat === '' || $lon === '' || !file_exists($filename))

return FALSE;

            $file = fopen($filename, 'r');

            $ll = $this->get_lat_long_adjustments($lat,$lon);
            $lat_dir = $ll['lat_dir'];
            $lat_adj = $ll['lat_adj'];
            $lon_dir = $ll['lon_dir'];
            $lon_adj = $ll['lon_adj'];
            $y = $lat;
            $x = $lon;

            //whole number - full number * lines (1201)
            // * (
            $line = (integer)(( (integer)$lat - $lat )* 1201);
            $pixel = round(($lon - (integer)$lon ) * 1201);

            //Debug
            if (isset($_SESSION['userdata']['id']) &&

$_SESSION['userdata']['id']=="-1") {
//echo "filename:$filename, lat:$lat, lon:$lon\n";
//echo "Line:$line, pixel:$pixel, iLine:$iLine,
offset $offset_no_adj
\n";
}
//file naming is from lower left corner.
//data is stored within the file from the upper left corner.
$offset = (($line_1201) + $pixel)_2;

            fseek($file, $offset);
            //reverse string - file read (handle, length)
            $h1 = bytes2int(strrev(fread($file, 2)));
            if ($h1 == -32768) {
                    $h1 = 0;
            }
            fclose ($file);
            return $h1;
    }

}

function bytes2int($val) {
$t = unpack("s", $val);
$ret = $t[1];
return $ret;
}

Regards

Ben Jolly

On 11 June 2015 at 15:31, SnicketsCPT [email protected] wrote:

Hi Jammin84

Did you perhaps have time to upload the changes?

Many Thanks

—
Reply to this email directly or view it on GitHub
#70 (comment).

[jammin84]

Thanks Spinza,

The problem originates from the southern hemisphere SRTM files being read in reverse byte order.

Someone will need to merge and test my code above (11th june) with the WiND version to properly fix this issue.

WiND version only works in Northern Hemisphere, my version above only works in Southern Hemisphere.

[thetechshack]

Hi there,
I'm using WiND v1.1-0-a1 and fixed the code with LOS issue, but I see the LOS graph is missing on that page/window. Another problem is LOS to APs and other nodes when editing nodes. See images.

What am I doing wrong or missing?
Thanks for your assist

[thetechshack]

Fixed it but there a lot of bugs to be fixed it seems. I'm no programmer but I find my way around.

[jammin84]

@thetechshack as we had issues getting pull requests resolved, we've now forked this project to https://github.com/southern-wind/wind