You can save it as text file and retains the accurate values.

    // Auxiliary function to make String from depth map array
    func getStringFrom2DimArray(array: [[Float32]], height: Int, width: Int) -> String
    {
        var arrayStr: String = ""
        for y in 0...height - 1
        {
            var lineStr = ""
            for x in 0...width - 1
            {
                lineStr += String(array[y][x])
                if x != width - 1
                {
                    lineStr += ","
                }
            }
            lineStr += "\n"
            arrayStr += lineStr
        }
        return arrayStr
    }

 let depthWidth2 = CVPixelBufferGetWidth(depthMap)
        let depthHeight2 = CVPixelBufferGetHeight(depthMap)
        CVPixelBufferLockBaseAddress(depthMap, CVPixelBufferLockFlags(rawValue: 0))
        let floatBuffer = unsafeBitCast(CVPixelBufferGetBaseAddress(depthMap), to: UnsafeMutablePointer<Float32>.self)
        var depthArray = [[Float32]]()
        for y in 0...depthHeight2 - 1
        {
            var distancesLine = [Float32]()
            for x in 0...depthWidth2 - 1
            {
                let distanceAtXYPoint = floatBuffer[y * depthWidth2 + x]
                distancesLine.append(distanceAtXYPoint)
                print("Depth in (\(x), \(y)): \(distanceAtXYPoint)")
            }
            depthArray.append(distancesLine)
        }

        let textDepthUrl = documentsDirectory.appendingPathComponent("depth_text_\(dateString).txt")
        
        let depthString: String = getStringFrom2DimArray(array: depthArray, height: depthHeight2, width: depthWidth2)

 try depthString.write(to: textDepthUrl, atomically: false, encoding: .utf8)