Creating maps using latitude and longitude

[Rudra_Banerjee]

Load occurrence data

read.csv("C:/Users/Hp/Desktop/Demo data_LatLong.csv")
Occurrence_data<- read.csv("C:/Users/Hp/Desktop/Demo data_LatLong.csv", header=TRUE, sep=",")
View(Occurrence_data)
library(maps)
library(mapdata)
library(mapproj)

Plot occurrence points on a map

ggplot() +
borders("world", colour = "gray50", fill = "white") + # Add world borders
geom_point(mapdata = Occurrence_data, aes(x = longitude, y = latitude), color = "blue", alpha = 0.5) + # Add occurrence points
ggtitle("Distribution map of plant species")
install.packages("tidyverse")

[Rudra_Banerjee]

I am trying to create an occurrence map of a plant species using the latitude and longitude data collected from the field. However, I am getting stuck at running the codes in 'R'. can anybody please help me in troubleshooting this?

Here is the error message I found
Error in FUN(X[[i]], ...) : object 'longitude' not found

[technocrat]

@Rudra_Banerjee

Occurrence_data

This data frame must have variables named longitude and latitude. Check with

colnames(Occurrence_data)

[Rudra_Banerjee]

Yes, the response comes as "Longitude" "Latitude". But, this is followed by the same error message. Here is how it looks..

1] "Longitude" "Latitude"
Error in FUN(X[[i]], ...) : object 'longitude' not found

[technocrat]

@Rudra_Banerjee

Longitude

Capitalization signifies. “Longitude” is not the same as “longitude.”

[Rudra_Banerjee]

This is what the code looks like

Load occurrence data

read.csv("C:/Users/Hp/Desktop/Demo data_LatLong.csv")
Occurrence_data<- read.csv("C:/Users/Hp/Desktop/Demo data_LatLong.csv", header=TRUE, sep=",")
View(Occurrence_data)

And this is how the console has responded

Load occurrence data

read.csv("C:/Users/Hp/Desktop/Demo data_LatLong.csv")
Latitude Longitude
1 12.97912 77.59130
2 18.93877 72.83534
3 13.08017 80.28383
4 28.65172 77.22194
Occurrence_data<- read.csv("C:/Users/Hp/Desktop/Demo data_LatLong.csv", header=TRUE, sep=",")
View(Occurrence_data)
Error in FUN(X[[i]], ...) : object 'longitude' not found

My excel dataset contains two columns such as Latitude and Longitude. I am still not able to figure out where am I getting wrong.

[andresrcs]

@Rudra_Banerjee

geom_point(mapdata = Occurrence_data, aes(x = longitude, y = latitude), color = "blue", alpha = 0.5) + # Add occurrence points

As Technocrat said, R is case sensitive, if the variables in your data frame are capitalized you have to type them the same way in your ggplot code. The previous line should be:

geom_point(mapdata = Occurrence_data, aes(x = Longitude, y = Latitude), color = "blue", alpha = 0.5) +

[Rudra_Banerjee]

Thanks @andresrcs . It worked

This map shows the entire world view. However, if I want to project only on one particular region of the world, for instance, some states of India, then how to add that one?

[andresrcs]

If you need more specific help, please provide a proper REPRoducible EXample (reprex) illustrating your issue.