OziExplorer och 7-parameter transformation

[avslLM]

Hej

Någon som har information om Des Newman har/kommer att införa 7-parameters transformation i OziExplorer?

Jag har letat på hans hemsida, men hittar ingen info kring just detta.

/torbjörn

 

[Brune]

Alla nöjda med nuvarande algoritm ?

Det är kanske ingen som inte är nöjd med noggrannheten. Store (Per Geijer) har gjort en del jämförelser mellan Fugawi som nog använder 7- parameter transformation och OziExplorer som använder någon annan transformation och han har nog kommit fram till att Fugawi är noggrannare.

Det enda jag hittar nu är http://www.utsidan.se/vb_forum/showthread.php?threadid=31456

Jag använder OziExplorer tillsammans med min karta från Lantmäteriverket och jag är fullständigt nöjd med noggrannheten. Är det något jag ska skriva till Des om som förbättringsförslag, så är det att ”Map view” inte är så bra med Lantmäterikartor sedan funktionen kom med att man kan välja storleken på ”Map view” rutan.

Per

 

[avslLM]

Bra kan bli bäst?

För min användning är jag intresserad av en noggrannhet som åtminstone ligger under det jag kan få från min GPS, och helst under metern.

Jag har skickat frågan till Des Newman och frågat om jag kan hjälpa honom med en rutin för 7-parameter transformation.

/torbjörn

 

[Brune]

Ibland är minnet kort . För så sent som för några månader sedan när jag håll på att klura ut lämpliga koordinater för Bergslagspaketet för Utekartan så jobbade jag i OziExplorer. Jag hade över 100 waypoints som i rikets nät och de flesta hade 3 st 0r på slutet (hela km). För att kolla att jag tänkt rätt (att ytan var 32*47 km) så skickade jag mina waypoints och rutter till GPSen (Garmin 60C), stängde OziExplorer och startade Kartex. När jag skickat waypoints och rutter till Kartex så skiljde det upp till 5-7 m i waypoint listan mot de koordinater jag angett i OziExplorer.

Men här var det nu 3 tillverkare (OziExplorer, Garmin och Kartex) inkopplade så jag kan inte utan mycket arbete, som jag inte är villig att lägga ner avgöra var i kedjan skillnaden uppstår.

Den intresserade kan läsa tabellen nedan
//Kartex WaypointFil skapad av Kartex 5.1
&KWF 2.0,rt 90 2.5 gon v,0
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Per Brune

 

[avslLM]

Jag har inte lika mycket data att jämföra med som du, Per

De enkla försök jag gjort på en karta med meterupplösning stämmer inte så illa faktiskt, det är nog snarare så att felet lika gärna kan bero på hur hur jag mätt.

Men det kan ju förstås bero på att jag befinner mig ganska nära medelmeridianen.

Jag ska testa vidare med litet kartdata så långt åt väster respektive österut jag kan komma, så får vi se hur stort felet blir då.

/torbjörn

 

[Brune]

Mina waypoints utgör gränserna på Utekartan Bergslagspaketet. Täckningen visas något förenklat på denna karta.

Per

 

[avslLM]

Nördigt?

Får löpa linan ut eftersom jag öppnat truten...

Jag gjorde två georefererade tif-bilder över Syd-Koster respektive Kataja, och importerade kartorna till OziExplorer. Jag zoomade in så att jag kunde mäta koordinater på en hörnpixel i vardera bilden.

Det här blev resultatet.

Västerut

Syd-Koster Kartex:
6541455.0
1222185.0

Syd-Koster OziExplorer:
6541452.0
1222192.0

Diff: 7.6 meter


Österut

Kataja Kartex:
7312285.0
1884400.0

Kataja OziExplorer:
7312288.0
1884398.0

Diff: 3.6 meter

/torbjörn

 

[Kepler]

Genom att först beräkna lat/lon för dessa punkter och därefter använda algoritmen bakom User Grid enligt http://www.lantmateriet.se/templates/LMV_Page.aspx?id=4953#Förbättrat samband för att gå tillbaka till X och Y blir felet bara 0.4 meter för båda dessa punkter.

Med andra ord, Swedish Grid skall inte användas i OziExplorer om man är intresserade av noggrannheter < 10 meter. Bättre att definiera sin egen User Grid i enlighet med det förträffliga tipset från Lantmäteriet.

Lite krångligt varför det skulle vara bra om Oziexplorer kunde implementera den fullständiga 7-parameters transformationen eller åtminstone Lantmäteriets förenklade User Grid-samband.

 

[Store]

Re: Alla nöjda med nuvarande algoritm ?

... Store (Per Geijer) har gjort en del jämförelser mellan Fugawi ... han har nog kommit fram till att Fugawi är noggrannare.

Jag har jämfört ett och samma färdspår plottat på samma karta i OziExplorer, Fugawi och Kartex. Resultatet kan studeras här http://wb854444.bahnhofbredband.se/track_compare/