22.01.2015 Views

(IVAR) - Final Report - Strategic Environmental Research and ...

(IVAR) - Final Report - Strategic Environmental Research and ...

(IVAR) - Final Report - Strategic Environmental Research and ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Figure 6-105. Track histories of targets selected from WIAR1 <strong>and</strong> eBirdRad radars at WASNI<br />

dataset for spatial alignment analysis. The green symbols represent the eBirdRad unit <strong>and</strong> the red<br />

the WIAR1.<br />

In order to demonstrate spatial alignment, we compared c<strong>and</strong>idate track pairs from the respective<br />

datasets. Table 6-34 shows the first three rows from one of the track comparisons performed for<br />

the NASWI dataset; refer to Table 6-35 for the total number of track comparisons performed for<br />

the datasets from the three test locations.<br />

Table 6-34. Comparison of corresponding track updates from two radars at NASWI on 13<br />

November 2009.<br />

Date<br />

Time<br />

(h:mm:ss)<br />

Track ID 408, WIAR1<br />

Head<br />

(deg)<br />

Speed<br />

(m/s)<br />

Latitude<br />

Longitude<br />

Time<br />

(h:mm:ss)<br />

Track ID: 607, eBirdRad<br />

Head<br />

(deg)<br />

Speed<br />

(m/s)<br />

Latitude<br />

Longitude<br />

Distance<br />

(m)<br />

Uncertainty<br />

(m)<br />

11/13/2009 2:02:02 207 16.6 48.3593 -122.6912 2:02:02 203 17.7 48.3589 -122.6914 45.0 276.2<br />

11/13/2009 2:02:05 207 16.6 48.3589 -122.6915 2:02:04 206 17.8 48.3586 -122.6917 34.1 276.2<br />

11/13/2009 2:02:08 216 16 48.3588 -122.692 2:02:07 209 18.2 48.3582 -122.6921 66.8 273.2<br />

Each row in Table 6-34 corresponds to track updates from the pair of radars. Because the radars<br />

are asynchronous, their times can differ by up to 1.2 seconds (see Section 6.5.1.2). We computed<br />

the spatial misalignment error (Distance) by taking the difference between the track<br />

positions for each update. The a priori spatial uncertainty (Uncertainty) was computed as per the<br />

235

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!