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4/20/23, 1:46 PM IPaC: Explore Location resources <br /> 1. The probability of presence for each week is calculated as the number of survey events in <br /> the week where the species was detected divided by the total number of survey events <br /> for that week. For example, if in week 12 there were 20 survey events and the Spotted <br /> Towhee was found in 5 of them, the probability of presence of the Spotted Towhee in <br /> week 12 is 0.25. <br /> 2. To properly present the pattern of presence across the year, the relative probability of <br /> presence is calculated. This is the probability of presence divided by the maximum <br /> probability of presence across all weeks. For example, imagine the probability of <br /> presence in week 20 for the Spotted Towhee is 0.05, and that the probability of presence <br /> at week 12 (0.25) is the maximum of any week of the year. The relative probability of <br /> presence on week 12 is 0.25/0.25 = 1; at week 20 it is 0.05/0.25 = 0.2. <br /> 3. The relative probability of presence calculated in the previous step undergoes a statistical <br /> conversion so that all possible values fall between 0 and 10, inclusive. This is the <br /> probability of presence score. <br /> To see a bar's probability of presence score, simply hover your mouse cursor over the bar. <br /> Breeding Season ( ) <br /> Yellow bars denote a very liberal estimate of the time-frame inside which the bird breeds <br /> across its entire range. If there are no yellow bars shown for a bird, it does not breed in your <br /> project area. � -; <br /> Survey Effort (1) VMS& <br /> Vertical black lines superimposed on probability of presence bars indicate the number of <br /> surveys performed for that species in the 10km grid cell(s) your project area overlaps. The <br /> number of surveys is expressed as a range, for example, 33 to 64 surveys. <br /> To see a bar's survey effort range, simply hover your mouse cursor over the bar. <br /> No Data ( ) <br /> A week is marked as having no data if there were no survey events for that week. <br /> Survey Timeframe <br /> Surveys from only the last 10 years are used in order to ensure delivery of currently relevant <br /> information. The exception to this is areas off the Atlantic coast, where bird returns are <br /> based on all years of available data, since data in these areas is currently much more sparse. <br /> probability of presence breeding season I survey effort no data <br /> SPECIES JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br /> Bald Eagle <br /> Non-BCC <br /> Vulnerable <br /> Chimney Swift 1 , . -- , <br /> BCC Rangewide <br /> (CON) <br /> https://ipac.ecosphere.fws.gov/location/LNE5CVVJ4CVF7TO2167UH5XMZZ4/resources 8/12 <br />