LAS (.las)
.las file signature | application/x-asprs
LAS is a standardized point cloud file format for storing LiDAR data, developed and maintained by the American Society for Photogrammetry and Remote Sensing (ASPRS). It is used in surveying, remote sensing, topographic mapping, forestry, and geospatial analysis to exchange airborne and terrestrial laser-scanning measurements. The format is generally considered safe, although very large or malformed datasets can affect processing tools; LAS remains a long-standing interchange format in geospatial workflows.
Magic Bytes
Offset 0
4C 41 53 46
Sources: Apache Tika
Extension
.las
MIME Type
application/x-asprs
Byte Offset
0
Risk Level
Safe
Validation Code
How to validate .las files in Python
def is_las(file_path: str) -> bool:
"""Check if file is a valid LAS by magic bytes."""
signature = bytes([0x4C, 0x41, 0x53, 0x46])
with open(file_path, "rb") as f:
return f.read(4) == signatureHow to validate .las files in Node.js
function isLAS(buffer: Buffer): boolean {
const signature = Buffer.from([0x4C, 0x41, 0x53, 0x46]);
return buffer.subarray(0, 4).equals(signature);
}How to validate .las files in Go
func IsLAS(data []byte) bool {
signature := []byte{0x4C, 0x41, 0x53, 0x46}
if len(data) < 4 {
return false
}
return bytes.Equal(data[:4], signature)
}API Endpoint
/api/v1/las
curl https://filesignature.org/api/v1/las
See the full API documentation for all endpoints and parameters.
Related Formats
Frequently Asked Questions
What is a .las file?
A .las file is identified by the magic bytes 4C 41 53 46 at byte offset 0. LAS is a standardized point cloud file format for storing LiDAR data, developed and maintained by the American Society for Photogrammetry and Remote Sensing (ASPRS). It is used in surveying, remote sensing, topographic mapping, forestry, and geospatial analysis to exchange airborne and terrestrial laser-scanning measurements. The format is generally considered safe, although very large or malformed datasets can affect processing tools; LAS remains a long-standing interchange format in geospatial workflows.
What are the magic bytes for .las files?
The magic bytes for LAS files are 4C 41 53 46 at byte offset 0. These bytes uniquely identify the file format regardless of the file extension.
How do I validate a .las file?
To validate a .las file, read the first bytes of the file and compare them against the known magic bytes (4C 41 53 46) at offset 0. This is more reliable than checking the file extension alone, as extensions can be renamed.
What is the MIME type for .las files?
The primary MIME type for .las files is application/x-asprs.
Is it safe to open .las files?
LAS (.las) files are generally safe to open. They are classified as low risk because they primarily contain data rather than executable code. However, always ensure files come from a trusted source.