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Occurrence records for Sturnella magna (USA)
Short title:
Mdwlark 86971 observation records for Eastern Meadowlark. Obtained from the Avian Knowledge Network (see the original query). After you download the data locally, you can convert it to a point map using: > AKN <- read.delim("AKN_Query_Results_95201085842.txt") # fix some columns: > AKN$Observation.Count <- ifelse(is.na(AKN$Observation.Count), AKN$Obs.Count.At.Least, AKN$Observation.Count) > AKN$Duration.In.Hours <- ifelse(AKN$Duration.In.Hours==0, 0.5, AKN$Duration.In.Hours) > AKN$Observation.Date <- as.Date(paste(AKN$Observation.Date)) # records in no / area / time (unfortunatelly Survey.Area.Size is missing) > AKN$Dens <- AKN$Observation.Count/AKN$Duration.In.Hours > AKN.pnt <- subset(AKN, !is.na(AKN$Longitude)&!is.na(AKN$Latitude)&is.finite(AKN$Dens), + select=c("Global.Unique.Identifier","Longitude","Latitude","Observation.Date", + "Dens","Collection.Code","Locality","Survey.Area.Identifier","Observation.Count","Duration.In.Hours")) # Convert to a point map: > AEA <- "+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 + +datum=NAD83 +units=m +no_defs" > coordinates(AKN.pnt) <-~Longitude+Latitude > proj4string(AKN.pnt) <- CRS("+proj=longlat +datum=WGS84") > AKN.pntXY <- spTransform(AKN.pnt, CRS("AEA")) > save(AKN.pntXY, file="AKN_Sturnella_magna_USA.RData") Avian Knowledge Network. 2009. Avian Knowledge Network: An online database of bird distribution and abundance [web application]. Ithaca, New York. Available layers:
Point map showing the distribution of a bird species through time. Description of columns available here. Spatial structure:
'data.frame': 86971 obs. of 8 variables: $ Global.Unique.Identifier: Factor w/ 90152 levels "URN:catalog:....",..: 61836 61685 61811 61801 ... $ Observation.Date :Class 'Date' num [1:86971] 14535 14532 12808 14533 14352 ... $ Dens : num 1.288 0.667 2 0.941 1.25 ... $ Collection.Code : Factor w/ 20 levels "EBIRD","EBIRD_AK",..: 1 1 1 1 1 1 1 1 1 1 ... $ Locality : Factor w/ 20073 levels "","'Big' Quintana pond",..: 16768 12147 8835 8855 13639 ... $ Survey.Area.Identifier : Factor w/ 21494 levels "L100019","L102957",..: 6825 12997 19949 1722 15230 8877 ... $ Observation.Count : int 3 1 1 4 5 12 1 50 1 1 ... $ Duration.In.Hours : num 2.33 1.5 0.5 4.25 4 3 0.5 3.5 11 9.08 ...
proj4:
+proj=aea +lat_1=29.5 +lat_2=45.5 +lat_0=23 +lon_0=-96 +x_0=0 +y_0=0 +ellps=GRS80 +datum=NAD83 +units=m +no_defs
Location:
United States
42° 26' 26.2608" N, 76° 29' 47.7852" W
Data owner:
Avian Knowledge Network
Reference:
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