View Photo Location from GPS Data Extract and display GPS coordinates from photo EXIF data with a location link.

The tool works by parsing the EXIF data embedded in JPEG files, specifically looking for the 0xFFE1 marker that indicates the start of the EXIF data. It then uses a DataView object to read the binary data and extract the GPS information from the IFD-GPS directory. The extractGPS function takes an ArrayBuffer as input and returns an object containing the latitude, longitude, and altitude coordinates. This function uses bitwise operations to read the Uint16 and Uint32 values from the binary data, and then converts these values to decimal numbers using rational pairs.

The tool utilizes React's useState hook to store the extracted GPS coordinates and any error messages that may occur during the parsing process. When a user drops a JPEG file into the FileDropzone component, the handleFile function is triggered, which reads the file as an ArrayBuffer using the FileReader API. The extractGPS function is then called with this ArrayBuffer as input, and the resulting coordinates are stored in the component's state.

The tool also uses the DataView object to read rational numbers from the EXIF data, which allows for precise calculations of the latitude, longitude, and altitude. The readRational function takes an offset into the binary data and returns a decimal number calculated from the rational pair at that offset. This function is used to convert the GPS coordinates from degrees/minutes/seconds to decimal format.

The extracted GPS coordinates are then formatted to 6 decimal places using the toFixed method, and displayed in the user interface along with any available altitude information. The tool also provides features such as copying the coordinates to the clipboard using the navigator.clipboard API, and opening the location in Google Maps by constructing a URL with the latitude and longitude parameters.