Point of Beginning

Which is more accurate - VD or SD+VA?

June 15, 2009

Posted By Neil Avila on 6/14/2009 at 10:14 PM

I use a Topcon GTS 7 series (Windows CE).

In field, I use collect data vertcal/hor distance. When I download data, I also download slope distance + vertical angle.

In spreadsheet I compare vert distance as from total station and vertical distance when computed from slope distance + vertical angle.

sometimes results are less than few mm. But when distances get into 1km+ difference now reach 10-20 cm.

I just want o know what is more accurate between 2 readings?

I use Topcon TS but maybe other surveyors using other brands also notice this condition.

Neil

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