ios - iPhone compass presents the wrong heading pitch angle is > about 45° -

-

this might hard explain geometry careful in spelling out. visible in standard compas app , data in cllocationmanager.

1) when holding phone in portrait orientation, consider pitch angle 0°

2) when pointing camera sky (such taking picture of cloud) pitch angle goes 0° -> 90° 90 degrees straight up.

3) when phone tilted upward (> 0 degrees , rotating on "x" magnetometer axis) , when phone @ (but not exactly) 45 degrees, compass heading rotates 180 degrees. while camera still point "n", compass report "s".

4) next (roughly) 90 degrees, compass heading rotated 180 degrees.

this rotation of heading destructive me , not align accelerometers. there tutorial (i did not find 1 off bat) on using the raw data (x, y, z) clheading data calculate heading data?

the end result want heading of compass match heading of camera.

you can't rely on solely compass heading. see answer you're looking for, , in particular cmattitude object's yaw property compensate pitch angle you're talking about: compensating compass lag gyroscope on iphone 4


Comments

Post a Comment

Popular posts from this blog

objective c - Change font of selected text in UITextView -

-
can suggest me how change font of selected text in uitextview.i cannot use uiwebview since have edit text. have seen pages app.how possible in app. see formatting text within uilabel differently . since need editing, should @ javascript-based editors such ckeditor or tinymce . highly recommend wwdc 2011 video session 511: "rich text editing in safari on ios."
Read more

php - Accessing POST data in Facebook cavas app -

-
so i've got simple form in canvas / iframe facebook app, , i'm trying pass along values post. reading on s.o. , fb's latest docs, understand it, data send via post form can accessed on receiving end $_request object. i read on thread on s.o. in order post forms work need pass along input named "signed_request" value current signed_request (i have signed request working ok otherwise...all login , authentication stuff working fine). isnt mentioned anywhere in official fb docs. so problem comes in $_request object signed request, , bunch of other session stuff. form inputs found. the way can read them set method of form "request" isn't real form method. takes of inputs , sends them args in url. horrible. here's sample page canvas app form i'm using try debug (leaving out authentication stuff): <form enctype="application/x-www-form-urlencoded" method="post" target="_top" id="my_form" action=...
Read more

c# - Getting control value when switching a view as part of a multiview -

-
i have following code in aspx page: <asp:button id="display_button" runat="server" text="display" onclick="button1_click" /> &nbsp; <asp:button id="edit_button" runat="server" text="edit" onclick="button2_click" /> &nbsp; <asp:button id="save_button" runat="server" text="save" onclick="button3_click" visible="false" /> &nbsp; <asp:multiview id="multiview1" runat="server" activeviewindex="0"> <asp:view id="view1" runat="server"> <asp:formview id="view_program" runat="server"> <itemtemplate> <%# eval("status").tostring().trim() %> </itemtemplate> </asp:formview> </asp:view> <asp:view id="view2" runat="server"> ...
Read more