Geometrics Forum - Recent Topics

How to use SeisImager 2D seismic profiles to be used in real world models

Randl Rivera — Tue, 07 Jul 2026 21:32:24 +0000

Q. We are now often being asked to provide our 2D seismic profiles to be used in real world models. When the inversion is done it has distance along line and depth/elevation as the output. Is there a way to add real world Northing/Easting coordinates into the data file so it can be more simply reference to the real world location the data was collected?

A. Thank you very much for using SeisImager.
So you want to add coordinate to 2D Vp or Vs cross sections.
You can use GeoPlot to add the coordinates either lat-lon or UTM.
GeoPlot can import cross sections from PlotRefa (.vs) and WaveEq (.pvs).
Use "Edit", "XY coordinates (latitude-longitude)" to add the coordinates.
See GeoPlot manual for more details.

https://seisimager.com/download/Geoplot_Manual_v2.0_ENGLISH.pdf

If you have several cross-sections, you may use GeoPlot3D to interpolate 2D cross sections to a 3D volume.

Using UART4 to stream data to a Rpi4

Ana Teresa Falcão — Thu, 02 Jul 2026 04:25:11 +0000

Hello,

I saw in a previous post that the current firmware only supports MFAM streaming via Ethernet, and that UART5 isn't supported. I'm modifying the Dev Kit firmware to add TX output on UART4 instead, by adding a parallel Mailbox_post in spiTaskFxns.c to a new UART4 TX task/mailbox, at 460800 bps.

Before going further, I wanted to ask:

Is there any hardware-level reason UART4 wouldn't work here, beyond it just not being implemented in the stock firmware?
Does the existing SPI→Ethernet pipeline assume a single consumer, in a way that could cause timing issues if I add a second parallel mailbox post for UART4?
Has anyone tried UART-based streaming from the Dev Kit before, and if so, any known pitfalls?

Thanks in advance!

MFAM Dev Kit TIVA example code

Rui Zhang — Thu, 28 May 2026 21:47:28 +0000

We will provide the example source code for MFAM Dev Kit 'as-is' for your reference and review. Please note that we do not provide any technical support, maintenance, debugging, or updates for this code.

Click below to download:

154

Methods for obtaining underwater positioning data during towing MagElement

Shinji Matsuda — Mon, 25 May 2026 05:04:52 +0000

If there are any practical examples of methods for acquiring underwater position information when towing a MagElement, please let me know.

For example, if acoustic positioning using transponders is employed, could you explain how it is implemented?

How to download or delete raw data from MagStation micro-SD card

Rui Zhang — Wed, 22 Apr 2026 00:27:28 +0000

1. Establish WIFI connection between your PC and the MagStation.

2. Open a web browser and type in http://192.168.1.1/supporttools.htm.

153

3. Click "Delete project storage" or "Download survey data" to delete or down raw data from micro-SD card. We recommend deleting raw data files after 700 hours data collection.

4. The downloaded survey data is in .magdata format. To convert it to CSV, open Survey Manager and create a new MagStation project. Inside the project, create a new survey. Select the survey name, click "Import Data" and then choose the .magdata file. After successful import, click "Export CSV".

Why does my mobile device sometimes disconnect from instrument WIFI?

Rui Zhang — Tue, 21 Apr 2026 19:38:13 +0000

Geometrics instruments, such as G-864, MagEx, MagArrow, MagStation et al, communicate with a mobile device via WIFI. But because the instrument WIFI has NO internet access, some Android device, after connecting to the instrument for a while, will automatically start searching for another WIFI access point. To prevent this from happening, when the No Internet Access warning window pops up after first WiFi connection, choose "Tap for options". On the following window, check the “Don’t ask again for this network” box and press “Yes” .

Teensy 4.1 with MFAM

Roi Granot — Wed, 25 Mar 2026 09:21:36 +0000

Hi All,

We are using the Teensy 4.1 as a logger (Adafruit GPS is linked with the Teensy) for the MFAM SX. Below is the code for the Arduino IDE (Teensy), for people who might find it useful,

Roi

#include

// ---- NETWORK CONFIGURATION ----

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };

IPAddress ip(192, 168, 2, 10);

IPAddress mfamIP(192, 168, 2, 2);

uint16_t mfamPort = 1000;

EthernetClient client;

// ---- PACKET STRUCTURE ----

const int PACKET_SIZE = 1380;

const int SAMPLE_SIZE = 32;

const int HEADER_SIZE = 16;

const int NUM_SAMPLES = 40;

const int SD_CHIP_SELECT = BUILTIN_SDCARD;

uint8_t buffer;

int bufferPos = 0;

// ---- SD CARD ----

File logFile;

bool sdReady = false;

unsigned long sampleCount = 0;

unsigned long fileStartTime = 0;

char filename;

// ---- AUXILIARY CHANNEL STORAGE ----

double gyroX = 0, gyroY = 0, gyroZ = 0, gyroT = 0;

double accelX = 0, accelY = 0, accelZ = 0, accelT = 0;

double compassX = 0, compassY = 0, compassZ = 0, compassT = 0;

// ---- GPS FROM ADAFRUIT MODULE ON SERIAL1 (Pin 0 = RX) ----

char gpsBuffer;

int gpsBufferPos = 0;

char gpsString = "";

char gpsDate = "00/00/00";

char gpsTime = "00:00:00.000";

bool gpsFix = false;

uint8_t tsStatus = 0;

// ---- OUTPUT CONTROL ----

// Set to 1 to log every sample, 10 for 100Hz, 20 for 50Hz, etc.

const int DOWNSAMPLE_FACTOR = 1; // 50 Hz output

int downsampleCounter = 0;

// How many minutes per file. Set to 10, 20, 60, etc.

const int FILE_MINUTES = 10;

// ---- LED INDICATOR ----

// Off = starting up

// Very slow blink (every 3 sec) = connected and logging

// Fast blink (4/sec) = connected but no data arriving

// Solid on = no SD card

// 3 quick flashes then pause = cannot connect to MFAM

const int LED_PIN = 13;

unsigned long lastBlinkTime = 0;

bool ledState = false;

unsigned long lastDataTime = 0;

// ---- FUNCTION PROTOTYPES ----

void createNewFile();

void parsePacket(uint8_t* pkt);

void parseAuxChannels(uint8_t* sample, uint16_t frameID);

void readGPS();

void parseGPRMC(char* sentence);

void writeSample(unsigned long timestamp, uint16_t fiducial, double mag1, uint16_t mag1s,

double mag2, uint16_t mag2s, uint16_t sysStatus);

int16_t toSigned16(uint16_t val);

void createNewFile() {

static int fileNumber = 0;

// On first call, find the next available file number

if (fileNumber == 0) {

char testName;

for (int i = 1; i <= 99999; i++) {

snprintf(testName, sizeof(testName), "MFAM_%05d.txt", i);

if (!SD.exists(testName)) {

fileNumber = i - 1; // Will be incremented below

break;

}

fileNumber++;

snprintf(filename, sizeof(filename), "MFAM_%05d.txt", fileNumber);

logFile = SD.open(filename, FILE_WRITE);

if (logFile) {

logFile.println("Mag 1,Mag 2,Fid,SysS,Mg1S,Mg2S,Gyro X,Gyro Y,Gyro Z,Gyro T,Accel X,Accel Y,Accel Z,Accel T,CompassX,CompassY,CompassZ,Comp T,Date,Time,TS Status,GPS");

logFile.flush();

fileStartTime = millis();

Serial.print("Logging to: ");

Serial.println(filename);

} else {

Serial.print("ERROR: Could not create ");

Serial.println(filename);

}

void setup() {

Serial.begin(115200);

delay(2000);

// Start GPS serial port (Adafruit Ultimate GPS defaults to 9600 baud)

Serial1.begin(9600);

pinMode(LED_PIN, OUTPUT);

digitalWrite(LED_PIN, LOW);

memset(gpsString, 0, sizeof(gpsString));

// Initialize SD card

if (SD.begin(SD_CHIP_SELECT)) {

sdReady = true;

Serial.println("SD card ready.");

} else {

Serial.println("WARNING: No SD card found. Serial output only.");

digitalWrite(LED_PIN, HIGH);

}

// Initialize Ethernet

Ethernet.begin(mac, ip);

if (Ethernet.hardwareStatus() == EthernetNoHardware) {

Serial.println("ERROR: No Ethernet hardware found!");

while (true) {}

}

Serial.print("Teensy IP: ");

Serial.println(Ethernet.localIP());

Serial.print("Connecting to MFAM at ");

Serial.print(mfamIP);

Serial.print(":");

Serial.println(mfamPort);

if (client.connect(mfamIP, mfamPort)) {

Serial.println("Connected to MFAM!");

} else {

Serial.println("Connection failed!");

}

Serial.println("Waiting for GPS fix...");

if (sdReady) {

createNewFile();

}

Serial.println("Mag 1,Mag 2,Fid,SysS,Mg1S,Mg2S,Gyro X,Gyro Y,Gyro Z,Gyro T,Accel X,Accel Y,Accel Z,Accel T,CompassX,CompassY,CompassZ,Comp T,Date,Time,TS Status,GPS");

}

void loop() {

// Always read GPS data from Serial1

readGPS();

if (!client.connected()) {

Serial.println("Disconnected. Reconnecting...");

if (sdReady && logFile) {

logFile.flush();

}

for (int i = 0; i < 3; i++) {

digitalWrite(LED_PIN, HIGH);

delay(100);

digitalWrite(LED_PIN, LOW);

delay(100);

}

delay(1400);

client.connect(mfamIP, mfamPort);

if (client.connected()) {

lastDataTime = millis();

}

return;

}

while (client.available()) {

buffer = client.read();

bufferPos++;

if (bufferPos >= PACKET_SIZE) {

parsePacket(buffer);

bufferPos = 0;

lastDataTime = millis();

}

// LED patterns

if (sdReady) {

if (millis() - lastDataTime > 3000) {

if (millis() - lastBlinkTime > 125) {

ledState = !ledState;

digitalWrite(LED_PIN, ledState ? HIGH : LOW);

lastBlinkTime = millis();

}

} else {

if (millis() - lastBlinkTime > 1500) {

ledState = !ledState;

digitalWrite(LED_PIN, ledState ? HIGH : LOW);

lastBlinkTime = millis();

}

// New file every FILE_MINUTES minutes

if (sdReady && logFile && (millis() - fileStartTime > (unsigned long)FILE_MINUTES * 60UL * 1000UL)) {

logFile.close();

createNewFile();

}

// ---- GPS READING FROM ADAFRUIT MODULE ON SERIAL1 ----

void readGPS() {

while (Serial1.available()) {

char c = Serial1.read();

if (c == '$') {

gpsBufferPos = 0;

}

if (gpsBufferPos < (int)sizeof(gpsBuffer) - 1) {

gpsBuffer = c;

gpsBufferPos++;

}

if (c == '\n' || c == '\r') {

gpsBuffer = '\0';

if (strncmp(gpsBuffer, "$GPRMC", 6) == 0 || strncmp(gpsBuffer, "$GNRMC", 6) == 0) {

// Save full sentence for logging

strncpy(gpsString, gpsBuffer, sizeof(gpsString) - 1);

gpsString = '\0';

// Remove trailing newline/carriage return

int slen = strlen(gpsString);

while (slen > 0 && (gpsString == '\n' || gpsString == '\r')) {

gpsString = '\0';

slen--;

}

parseGPRMC(gpsBuffer);

}

gpsBufferPos = 0;

}

void parseGPRMC(char* sentence) {

// $GPRMC,HHMMSS.sss,A,lat,N,lon,W,speed,course,DDMMYY,...

char copy;

strncpy(copy, sentence, sizeof(copy) - 1);

copy = '\0';

char* token = strtok(copy, ",");

int field = 0;

while (token != NULL && field < 10) {

switch (field) {

case 1: // Time

if (strlen(token) >= 6) {

snprintf(gpsTime, sizeof(gpsTime), "%c%c:%c%c:%s",

token, token, token, token, token + 4);

}

break;

case 2: // Fix status

gpsFix = (token == 'A');

break;

case 9: // Date

if (strlen(token) >= 6) {

snprintf(gpsDate, sizeof(gpsDate), "%c%c/%c%c/%c%c",

token, token, token, token, token, token);

}

break;

}

token = strtok(NULL, ",");

field++;

}

// Update GPS bits of tsStatus

tsStatus = (tsStatus & 0x0C); // Keep MFAM PPS bits (3,2)

tsStatus |= 0x01; // Bit 0: RMC sentence received

if (gpsFix) {

tsStatus |= 0x02; // Bit 1: GPS fix valid

}

// ---- MFAM DATA PARSING ----

int16_t toSigned16(uint16_t val) {

if (val > 32767) return (int16_t)(val - 65536);

return (int16_t)val;

}

void parseAuxChannels(uint8_t* sample, uint16_t frameID) {

uint8_t auxID = (frameID >> 11) & 0x07;

uint16_t aux0 = sample | (sample << 8);

uint16_t aux1 = sample | (sample << 8);

uint16_t aux2 = sample | (sample << 8);

uint16_t aux3 = sample | (sample << 8);

switch (auxID) {

case 1:

compassX = toSigned16(aux0) / 0.01333333;

compassY = toSigned16(aux1) / 0.01333333;

compassZ = toSigned16(aux2) / 0.01333333;

compassT = toSigned16(aux3) / 128.0 + 25.0;

break;

case 2:

gyroX = toSigned16(aux0) / 16.384;

gyroY = toSigned16(aux1) / 16.384;

gyroZ = toSigned16(aux2) / 16.384;

gyroT = toSigned16(aux3) / 512.0 + 23.0;

break;

case 4:

accelX = toSigned16(aux0) / 16384.0;

accelY = toSigned16(aux1) / 16384.0;

accelZ = toSigned16(aux2) / 16384.0;

accelT = toSigned16(aux3) / 512.0 + 23.0;

break;

default:

break;

}

void writeSample(unsigned long timestamp, uint16_t fiducial, double mag1, uint16_t mag1s,

double mag2, uint16_t mag2s, uint16_t sysStatus) {

char tsStr;

snprintf(tsStr, sizeof(tsStr), "%d%d%d%d%d%d%d%d",

(tsStatus >> 7) & 1, (tsStatus >> 6) & 1, (tsStatus >> 5) & 1, (tsStatus >> 4) & 1,

(tsStatus >> 3) & 1, (tsStatus >> 2) & 1, (tsStatus >> 1) & 1, tsStatus & 1);

char sysHex, m1sHex, m2sHex;

snprintf(sysHex, sizeof(sysHex), "%04X", sysStatus);

snprintf(m1sHex, sizeof(m1sHex), "%04X", mag1s);

snprintf(m2sHex, sizeof(m2sHex), "%04X", mag2s);

char line;

snprintf(line, sizeof(line),

"%10.4f,%10.4f,%4d,%s,%s,%s,%10.2f,%10.2f,%10.2f,%5.1f,%8.5f,%8.5f,%8.5f,%5.1f,%8.1f,%8.1f,%8.1f,%5.1f,%s,%s,%s,%s",

mag1, mag2, fiducial, sysHex, m1sHex, m2sHex,

gyroX, gyroY, gyroZ, gyroT,

accelX, accelY, accelZ, accelT,

compassX, compassY, compassZ, compassT,

gpsDate, gpsTime, tsStr, gpsString);

if (sdReady && logFile) {

logFile.println(line);

if (sampleCount % 1000 == 0) {

logFile.flush();

}

if (sampleCount % 500 == 0) {

Serial.println(line);

}

void parsePacket(uint8_t* pkt) {

// Get PPS bits from MFAM system status

uint16_t firstSysStatus = pkt | (pkt << 8);

uint8_t mfamPPSbits = (firstSysStatus >> 12) & 0x0C;

tsStatus = (tsStatus & 0x03) | mfamPPSbits;

for (int i = 0; i < NUM_SAMPLES; i++) {

int offset = HEADER_SIZE + (i * SAMPLE_SIZE);

uint16_t frameID = pkt | (pkt << 8);

uint16_t fiducial = frameID & 0x07FF;

uint16_t sysStatus = pkt | (pkt << 8);

uint32_t mag1raw = pkt | (pkt << 8) |

((uint32_t)pkt << 16) | ((uint32_t)pkt << 24);

double mag1 = mag1raw * 0.05 / 1000.0;

uint16_t mag1status = pkt | (pkt << 8);

uint32_t mag2raw = pkt | (pkt << 8) |

((uint32_t)pkt << 16) | ((uint32_t)pkt << 24);

double mag2 = mag2raw * 0.05 / 1000.0;

uint16_t mag2status = pkt | (pkt << 8);

parseAuxChannels(pkt + offset, frameID);

sampleCount++;

downsampleCounter++;

if (downsampleCounter >= DOWNSAMPLE_FACTOR) {

downsampleCounter = 0;

writeSample(millis(), fiducial, mag1, mag1status, mag2, mag2status, sysStatus);

}

Survey Manager quits when exporting to Montaj/GDB format

Magnetics SW — Wed, 17 Dec 2025 18:26:02 +0000

Survey Manager 3.5.1433 and earlier versions may exit unexpectedly after the user has selected "Export GDB" to export magnetometer survey data to a Montaj-compatible database..

Survey Manager may exit without notice or it may show some information about the failure, including steps to open a service request with Seequent.

On systems with Montaj 2025.1 or earlier, this issue may be fixed by updating Montaj to the most recent version (2025.2 at the time of this post) and verifying that Survey Manager is at its most recent version (3.5.1433 at the time of this post).

Quickstart Guide Now Available

Gretchen Schmauder — Wed, 29 Oct 2025 16:31:38 +0000

Find the most recent version of the Quickstart Guide on the MagElement product page, or click the link

here

Quickstart Guide Now Available

Gretchen Schmauder — Wed, 29 Oct 2025 16:24:06 +0000

Find the most recent version of the Quickstart Guide on the MagStation product page, or click the link

here